Bug 1336559 - Rename source-check kind to source-test, r=dustin

The name 'source-check' is a bit of a misnomer, because it already includes a bunch
of tasks that are proper unittests, not lints. Some of these unittests will soon
depend on a build task, which makes 'source-check' feel even more wrong.

They still have a lot in common with the lint tasks though, so it's probably not
worth splitting this into two separate kinds. Instead, let's just rename this kind
to 'source-test', which means, any task that tests stuff and is run from the source
directory (instead of a tests.zip). I think both lints and python-tests fall squarely
under this definition.

MozReview-Commit-ID: K0gZ5rVLyeD

taskcluster/taskgraph/try_option_syntax.py

@@ -35,7 +35,7 @@ BUILD_KINDS = set([
 
 # anything in this list is governed by -j
 JOB_KINDS = set([
-    'source-check',
+    'source-test',
     'toolchain',
     'marionette-harness',
     'android-stuff',