Extend test timeout to 120s

This may help tests pass when running under 4 vcpus.  Also:

A following change adds more git operations to most of the tests.
This is because each git repo must be listed in the tenant config
file, and many tests share a tenant config with quite a number
of repos which they don't use.  We should improve the tests so that
they don't operate on repos that they don't need, but that will
take some work.

Change-Id: I91a327968359b3650fbe0477e99dc274a1fb6266
diff --git a/tests/unit/test_scheduler.py b/tests/unit/test_scheduler.py
index 43a8ddf..d3e6094 100755
--- a/tests/unit/test_scheduler.py
+++ b/tests/unit/test_scheduler.py
@@ -1368,7 +1368,7 @@
     def test_dependent_behind_dequeue(self):
         # This particular test does a large amount of merges and needs a little
         # more time to complete
-        self.wait_timeout = 90
+        self.wait_timeout = 120
         "test that dependent changes behind dequeued changes work"
         # This complicated test is a reproduction of a real life bug
         self.sched.reconfigure(self.config)