Bug 1143264 - Alias mochitests to mochitest r=garndt

--HG--
extra : rebase_source : ce3f6d12971a0d3170d10f3c8607e6468594b5ac

testing/taskcluster/tasks/branches/base_job_flags.yml

@@ -2,6 +2,9 @@
 # List of all possible flags for each category of tests used in the case where
 # "all" is specified.
 flags:
+  aliases:
+    mochitests: mochitest
+
   builds:
     - emulator
     - emulator-jb