repair aodh image dockerfile

1. Add the missing packages in the aodh image
   packages: pymongo

2. Add aodh sudoer

3. aodh sync db command is error
   sync db command is: aodh-dbsync
   Reference link: http://docs.openstack.org/developer/aodh/install/manual.html

4. Add aodh-api running as a mod_wsgi

   Reference link: http://docs.openstack.org/developer/aodh/install/mod_wsgi.html

Closes-Bug: #1609000

Change-Id: Ia3706794059231fa08444e32eb034d64fbfa5182