[1] *scm_test.py are deeply broken, svnadmin is missing for svn_bin\.
And the git test are failing at shutdown.

Also Fix SvnCheckout.testMove flakiness.

TBR=ilevy@chromium.org,szager@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/14729012

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@198900 0039d316-1c4b-4281-b951-d872f2087c98