Add options to manage-projects

It has a command line arg parser.  With --help.

It can be told to only process one project.

It can output verbose debugging information.

It can save its temp directory so it can be examined later by an
operator.

Change-Id: Ide6d68590e0bf89efef720542bd1730533428160
diff --git a/requirements.txt b/requirements.txt
index 17f92bb..994ad98 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+argparse
 gerritlib
 MySQL-python
 paramiko