Remove unused git_root variable

Change-Id: Ie82b7c025d223c51f8d70c4bf010b568bd8bc226
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/zuul/launcher/ansiblelaunchserver.py b/zuul/launcher/ansiblelaunchserver.py
index fe29429..0f827c4 100644
--- a/zuul/launcher/ansiblelaunchserver.py
+++ b/zuul/launcher/ansiblelaunchserver.py
@@ -78,8 +78,6 @@
     def __init__(self, keep=False):
         self.keep = keep
         self.root = tempfile.mkdtemp()
-        self.git_root = os.path.join(self.root, 'git')
-        os.makedirs(self.git_root)
         self.ansible_root = os.path.join(self.root, 'ansible')
         os.makedirs(self.ansible_root)
         self.plugins_root = os.path.join(self.ansible_root, 'plugins')