Fix collectors and dependencies for ostf-init and Postgre::Db

* Put Exec[ostf-init] after its definition instead of before
* Use -> instead of before/require (should not be used ot once)
* Fix case 'dev' logic by moving collection to the appropriate place

Closes-bug: #1314165

Change-Id: Ib1b4f14bd24594c6a506450c436baf64ff39b74d
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Merge "Fix collectors and dependencies for ostf-init and Postgre::Db"