Bug 1270317 - Upgrade to Mercurial 3.7.3 in the mozharness test environment; r=jlund

We had a test environment running on Python 2.6 and an ancient version
of Mercurial. AFAICT we run Python 2.7 everywhere, so this environment
can be dropped.

We also upgrade to Mercurial 3.7.3, as that is what automation now runs.

MozReview-Commit-ID: 7WTyD3CUjtj

--HG--
extra : rebase_source : 8e37b215fb2bff2f12658fd5ad3b61d631ec26c7

testing/mozharness/requirements.txt

@@ -8,7 +8,7 @@ dulwich==0.8.7
 hg-git==0.4.0
 logilab-astng==0.24.2
 logilab-common==0.59.0
-mercurial==2.6.3
+mercurial==3.7.3
 mock==1.0.1
 nose==1.2.1
 ordereddict==1.1
@@ -22,4 +22,4 @@ virtualenv==1.5.1
 wsgiref==0.1.2
 urllib3==1.9.1
 google-api-python-client==1.3.1
-oauth2client==1.4.2
+oauth2client==1.4.2

testing/mozharness/tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27-hg2.6
+envlist = py27-hg3.7
 
 [base]
 deps =
@@ -15,15 +15,10 @@ setenv =
 commands =
     coverage run --source configs,mozharness,scripts --branch {envbindir}/nosetests -v --with-xunit --rednose --force-color {posargs}
 
-[testenv:py27-hg2.6]
+[testenv:py27-hg3.7]
 deps =
     {[base]deps}
-    mercurial==2.6.2
-
-[testenv:py27-hg3.2]
-deps =
-    {[base]deps}
-    mercurial==3.2.4
+    mercurial==3.7.3
 
 [testenv:py27-coveralls]
 deps=

testing/taskcluster/tasks/tests/mozharness-gecko.yml

@@ -30,7 +30,7 @@ task:
           tc-vcs checkout ./gecko {{base_repository}} {{head_repository}} {{head_rev}} {{head_ref}} &&
           cd gecko/testing/mozharness &&
           pip install tox &&
-          tox -e py27-hg2.6 -e py27-hg3.2
+          tox -e py27-hg3.7
   extra:
     extra:
         build_product: '{{build_product}}'