GITC: Pull GITC Manifest Dir from the config.

Updates the repo launcher and gitc_utils to pull the manifest
directory location out of the gitc config file.

Change-Id: Id08381b8a7d61962093d5cddcb3ff6afbb13004b
diff --git a/manifest_xml.py b/manifest_xml.py
index b33ec62..a7fe8dd 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -956,7 +956,7 @@
     super(GitcManifest, self).__init__(repodir)
     self.isGitcClient = True
     self.gitc_client_name = gitc_client_name
-    self.gitc_client_dir = os.path.join(gitc_utils.GITC_MANIFEST_DIR,
+    self.gitc_client_dir = os.path.join(gitc_utils.get_gitc_manifest_dir(),
                                         gitc_client_name)
     self.manifestFile = os.path.join(self.gitc_client_dir, '.manifest')