Fix deps2git cache bootstrapping and make it more verbose

git_tools.py

Index: git_tools.py
diff --git a/git_tools.py b/git_tools.py
index 5f52f9e593dc68ebadd6c988c056582c45e69af5..6cfba8c26d79ab4a29549241fc55c0c9d9dd6c44 100755
--- a/git_tools.py
+++ b/git_tools.py
@@ -149,14 +149,15 @@ def Clone(git_url, git_repo, is_mirror, out_buffer=None):
   return Git(None, cmd, is_mirror=is_mirror, out_buffer=out_buffer)
 
 
-def PopulateCache(git_url, shallow=False):
+def PopulateCache(git_url, shallow=False, print_fn=None):
   # --shallow by default checks out 10000 revision, but for really large
   # repos like adobe ones, we want significantly less than 10000.
   depth = None
   if shallow and 'adobe' in git_url:
     depth = 10
-  mirror = git_cache.Mirror(git_url, print_func=lambda *args: None)
-  mirror.populate(depth=depth, shallow=shallow, ignore_lock=True)
+  mirror = git_cache.Mirror(git_url, print_func=print_fn)
+  mirror.populate(depth=depth, shallow=shallow, bootstrap=True,
+                  verbose=True, ignore_lock=True)
   return mirror.mirror_path