WebRTC: Add/rename peerconnection_unittests test

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_mac_rel.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.webrtc",
       "--builder",
       "mac_rel",
@@ skipping 251 matching lines @@
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--factory-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
       "--build-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
-      "--test-type=libjingle_peerconnection_unittest",
-      "--step-name=libjingle_peerconnection_unittest",
+      "--test-type=modules_tests",
+      "--step-name=modules_tests",
       "--builder-name=mac_rel",
       "--slave-name=slavename",
       "--run-python-script",
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "[SLAVE_BUILD]/src/third_party/gtest-parallel/gtest-parallel",
-      "[SLAVE_BUILD]/src/out/Release/libjingle_peerconnection_unittest",
+      "[SLAVE_BUILD]/src/out/Release/modules_tests",
       "--"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "libjingle_peerconnection_unittest"
+    "name": "modules_tests"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--factory-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
       "--build-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
-      "--test-type=modules_tests",
-      "--step-name=modules_tests",
+      "--test-type=modules_unittests",
+      "--step-name=modules_unittests",
       "--builder-name=mac_rel",
       "--slave-name=slavename",
       "--run-python-script",
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "[SLAVE_BUILD]/src/third_party/gtest-parallel/gtest-parallel",
-      "[SLAVE_BUILD]/src/out/Release/modules_tests",
+      "[SLAVE_BUILD]/src/out/Release/modules_unittests",
       "--"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "modules_tests"
+    "name": "modules_unittests"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--factory-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
       "--build-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
-      "--test-type=modules_unittests",
-      "--step-name=modules_unittests",
+      "--test-type=peerconnection_unittests",
+      "--step-name=peerconnection_unittests",
       "--builder-name=mac_rel",
       "--slave-name=slavename",
       "--run-python-script",
       "--revision=f27fede2220bcd326aee3e86ddfd4ebd0fe58cb9",
       "[SLAVE_BUILD]/src/third_party/gtest-parallel/gtest-parallel",
-      "[SLAVE_BUILD]/src/out/Release/modules_unittests",
+      "[SLAVE_BUILD]/src/out/Release/peerconnection_unittests",
       "--"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "modules_unittests"
+    "name": "peerconnection_unittests"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--factory-properties",
       "{\"BUILD_CONFIG\": \"Release\", \"buildername\": \"mac_rel\", \"issue\": 666666, \"mastername\": \"tryserver.webrtc\", \"patchset\": 1, \"recipe\": \"webrtc/standalone\", \"revision\": \"12345\", \"rietveld\": \"https://fake.rietveld.url\", \"slavename\": \"slavename\"}",
@@ skipping 178 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "webrtc_nonparallel_tests"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]