Milo: Print raw json for buildbot build properties

milo/appengine/buildbot/expectations/CrWinGoma.30608.build.json

 {
   "Summary": {
     "ParentLabel": {
       "Label": "CrWinGoma",
       "URL": "."
     },
     "Label": "#30608",
     "Status": "Success",
     "Bot": {
       "Label": "build28-m1",
@@ skipping 509 matching lines @@
         "recipe result"
       ]
     }
   ],
   "PropertyGroup": [
     {
       "GroupName": "Annotation(bot_update)",
       "Property": [
         {
           "Key": "got_angle_revision",
-          "Value": "07529ff8dcacd94b93d432122d0c6aa68631843a"
+          "Value": "\"07529ff8dcacd94b93d432122d0c6aa68631843a\""
         },
         {
           "Key": "got_buildtools_revision",
-          "Value": "8dd3c8e39a48743c4eb790d9a8abe9676b617046"
+          "Value": "\"8dd3c8e39a48743c4eb790d9a8abe9676b617046\""
         },
         {
           "Key": "got_nacl_revision",
-          "Value": "f9308087f764c0f4341e3200baded605c917eb49"
+          "Value": "\"f9308087f764c0f4341e3200baded605c917eb49\""
         },
         {
           "Key": "got_revision",
-          "Value": "bfdee36d31a624d330b60b481fc26d10dff81b97"
+          "Value": "\"bfdee36d31a624d330b60b481fc26d10dff81b97\""
         },
         {
           "Key": "got_revision_cp",
-          "Value": "refs/heads/master@{#398661}"
+          "Value": "\"refs/heads/master@{#398661}\""
         },
         {
           "Key": "got_swarming_client_revision",
-          "Value": "df6e95e7669883c8fe9ef956c69a544154701a49"
+          "Value": "\"df6e95e7669883c8fe9ef956c69a544154701a49\""
         },
         {
           "Key": "got_v8_revision",
-          "Value": "af2ed87b122bd32cc53285dc7579530ae08731e5"
+          "Value": "\"af2ed87b122bd32cc53285dc7579530ae08731e5\""
         },
         {
           "Key": "got_v8_revision_cp",
-          "Value": "refs/heads/5.3.182@{#1}"
+          "Value": "\"refs/heads/5.3.182@{#1}\""
         },
         {
           "Key": "got_webrtc_revision",
-          "Value": "393886f22bb16e991b0fc57d7e290637d307448a"
+          "Value": "\"393886f22bb16e991b0fc57d7e290637d307448a\""
         },
         {
           "Key": "got_webrtc_revision_cp",
-          "Value": "refs/heads/master@{#13070}"
+          "Value": "\"refs/heads/master@{#13070}\""
         }
       ]
     },
     {
       "GroupName": "Annotation(setup_properties)",
       "Property": [
         {
           "Key": "recipe",
-          "Value": "chromium"
+          "Value": "\"chromium\""
         }
       ]
     },
     {
       "GroupName": "Annotation(update_scripts)",
       "Property": [
         {
           "Key": "build_revision",
-          "Value": "94dbe001292dcec3423c5d1b0374826ff89a8f46"
+          "Value": "\"94dbe001292dcec3423c5d1b0374826ff89a8f46\""
         },
         {
           "Key": "build_scm",
-          "Value": "git"
+          "Value": "\"git\""
         }
       ]
     },
     {
       "GroupName": "Build",
       "Property": [
         {
           "Key": "blamelist",
-          "Value": "[agrieve@chromium.org dcheng@chromium.org dtseng@chromium.org fsamuel@chromium.org gab@chromium.org moshayedi@chromium.org yolandyan@google.com]"
+          "Value": "[\"agrieve@chromium.org\",\"dcheng@chromium.org\",\"dtseng@chromium.org\",\"fsamuel@chromium.org\",\"gab@chromium.org\",\"moshayedi@chromium.org\",\"yolandyan@google.com\"]"
         },
         {
           "Key": "branch",
-          "Value": "master"
+          "Value": "\"master\""
         },
         {
           "Key": "buildnumber",
           "Value": "30608"
         },
         {
           "Key": "project",
-          "Value": "chromium"
+          "Value": "\"chromium\""
         },
         {
           "Key": "repository",
-          "Value": "https://chromium.googlesource.com/chromium/src"
+          "Value": "\"https://chromium.googlesource.com/chromium/src\""
         },
         {
           "Key": "requestedAt",
-          "Value": "2016-06-08T20:24:36Z"
+          "Value": "1465417476"
         },
         {
           "Key": "revision",
-          "Value": "bfdee36d31a624d330b60b481fc26d10dff81b97"
+          "Value": "\"bfdee36d31a624d330b60b481fc26d10dff81b97\""
         }
       ]
     },
     {
       "GroupName": "BuildSlave",
       "Property": [
         {
           "Key": "slavename",
-          "Value": "build28-m1"
+          "Value": "\"build28-m1\""
         }
       ]
     },
     {
       "GroupName": "Builder",
       "Property": [
         {
           "Key": "buildername",
-          "Value": "CrWinGoma"
+          "Value": "\"CrWinGoma\""
         }
       ]
     },
     {
       "GroupName": "Change",
       "Property": [
         {
           "Key": "git_revision",
-          "Value": "bfdee36d31a624d330b60b481fc26d10dff81b97"
+          "Value": "\"bfdee36d31a624d330b60b481fc26d10dff81b97\""
         }
       ]
     },
     {
       "GroupName": "Scheduler",
       "Property": [
         {
           "Key": "scheduler",
-          "Value": "chromium"
+          "Value": "\"chromium\""
         }
       ]
     },
     {
       "GroupName": "master.cfg",
       "Property": [
         {
           "Key": "buildbotURL",
-          "Value": "http://build.chromium.org/p/chromium.fyi/"
+          "Value": "\"http://build.chromium.org/p/chromium.fyi/\""
         },
         {
           "Key": "mastername",
-          "Value": "chromium.fyi"
+          "Value": "\"chromium.fyi\""
         }
       ]
     },
     {
       "GroupName": "slave",
       "Property": [
         {
           "Key": "workdir",
-          "Value": "C:\\b\\build\\slave/CrWinGoma"
+          "Value": "\"C:\\\\b\\\\build\\\\slave/CrWinGoma\""
         }
       ]
     }
   ],
   "Blame": [
     {
       "AuthorName": "",
       "AuthorEmail": "moshayedi@chromium.org",
       "Repo": "https://chromium.googlesource.com/chromium/src",
       "Branch": "",
@@ skipping 170 matching lines @@
       "Title": "Update GN docs about target_cpu to encourage use of current_cpu",
       "Changelist": null,
       "CommitURL": "",
       "File": [
         "",
         ""
       ]
     }
   ]
 }