Add Apache License Content in index.rst
Add Apache License Content in index.rst

Add Apache License 2.0 Content which is necessary
for ./releasenotes/source/index.rst.

Change-Id: I171e1afa5ccf5b7ab3005a3b2a12e90056ac8230

stackforge/cloudkitty,stackforge/cloudkitty,openstack/cloudkitty,openstack/cloudkitty