Add support for LUCI_CONTEXT.

recipe_modules/context/examples/full.expected/basic.json

Index: recipe_modules/context/examples/full.expected/basic.json
diff --git a/recipe_modules/context/examples/full.expected/basic.json b/recipe_modules/context/examples/full.expected/basic.json
index f1bb9e1ba325d93f5d003412c0d69dfd9ea021ef..0b1e0b9d72eb786d82a7e4e796204bb3fbbfd34f 100644
--- a/recipe_modules/context/examples/full.expected/basic.json
+++ b/recipe_modules/context/examples/full.expected/basic.json
@@ -113,6 +113,20 @@
     ]
   },
   {
+    "cmd": [
+      "echo",
+      "val"
+    ],
+    "name": "value in the context"
+  },
+  {
+    "cmd": [
+      "echo",
+      "zzz"
+    ],
+    "name": "value in the context (2)"
+  },

[iannucci, 2017/08/04 18:55:51]

the blacklist prevents the luci_config stuff from showing up here; I don't think
that's what we want.

+  {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0