Fix deps2git cache bootstrapping and make it more verbose

deps2git.py

Index: deps2git.py
diff --git a/deps2git.py b/deps2git.py
index d40544974a4091be320a4ef4ee1fa64cf9da6e44..381ef2c9a0fad064f8e30405dc4f3aedadfb34c0 100755
--- a/deps2git.py
+++ b/deps2git.py
@@ -65,7 +65,8 @@ def SplitScmUrl(url):
 
 def SvnRevToGitHash(
     svn_rev, git_url, repos_path, workspace, dep_path, git_host,
-    svn_branch_name=None, cache_dir=None, outbuf=None, shallow=None):
+    svn_branch_name=None, cache_dir=None, outbuf=None, shallow=None,
+    print_fn=None):
   """Convert a SVN revision to a Git commit id."""
   git_repo = None
   if git_url.startswith(git_host):
@@ -85,7 +86,7 @@ def SvnRevToGitHash(
       git_tools.Clone(git_url, git_repo_path, mirror, outbuf)
   elif cache_dir:
     mirror = True
-    git_repo_path = git_tools.PopulateCache(git_url, shallow)
+    git_repo_path = git_tools.PopulateCache(git_url, shallow, print_fn=print_fn)
   else:
     mirror = False
     git_repo_path = os.path.join(workspace, dep_path)
@@ -189,7 +190,7 @@ def ConvertDepMain(dep_q, message_q, options, results):
         try:
           git_hash = '@%s' % SvnRevToGitHash(
               dep_rev, git_url, options.repos, options.workspace, path,
-              git_host, svn_branch, options.cache_dir)
+              git_host, svn_branch, options.cache_dir, print_fn=_print)
         except Exception as e:
           if options.no_fail_fast:
             results.bad_git_hash.append(e)