rectified tabs of contrail_storage.pp

Missed one more storage-scope change.

Disabled nova.conf changes for make storage-scope=global as default
Added logrotate.d/ceph. missed to check-in previously

Fixed ceph log rotation issue
1. added 500M as size for ceph-log-rotate file
2. added crontab for invoking logrotate every 30 minutes
3. fixes a issue in live-migration related to user:group of
	/var/lib/nova/instances/global directory
4. added storage-scope=global for nova.conf

Change-Id: I46a07b7626488590de1971cc235fef2d7e48366c