Remove copyright and comments from empty files

According to policy change in HACKING:
http://docs.openstack.org/developer/hacking/#openstack-licensing
empty files should no longer contain any comments and copyright notices.

Change-Id: I78b399db314518be917e1c1931f2ee5c3a2ee95a
Closes-Bug: #1262424
Corrects service URLs from "%s/%s/" to "%s/%s"

Reasons:
- "%s/%s/" adds extra / making it "//" whenever it goes to the resources
  like nova or heat or cinder.
- Though it was working fine for nova and cinder, but following recent
  changes on heat/heat-client this is giving an error:
  "The resource could not be found.".

Changes:
- Updates the URLs from "%s/%s/" to "%s/%s".

Change-Id: I95b2601c7eaf577eb13590cbb74255ecbd5b9f1d
Closes-Bug: #1271126
Merge "Remove copyright and comments from empty files"
Merge "Corrects service URLs from "%s/%s/" to "%s/%s""
Initial support for single instance MongoDB support

This code adds ability to create/delete instance
with mongodb service type. No other operations are supported.

Implements blueprint: single-instance-mongodb-ga

Change-Id: I3d2992dce02dec22d09cedee6bbfbf51286b9b3b