Cleanup jjb files

- Remove the jobs that do nothing such as merge and daily jobs
- Leave only verify jobs for all the projects as placeholders
- Introduce stable/brahmaputra branch and keep it disabled

Please note that the "real" jobs for bottlenecks, compass4nfv,
functest, and qtip are not deleted.

Change-Id: I80031f77a11c2bf5173fbb7be98294285e3cc2ef
Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>