core: Move existing dependecies modules to common

Moves existing dependencies modules from backend/manager/dependencies to
backend/manager/dependencies/common. This is the preparation to
introduce dependencies which uses different implementations for JBoss
instance and for standalone tools.

Change-Id: I24f42866edb74f30186a96c8baecced7f389b5db
Related-To: https://bugzilla.redhat.com/1109871
Signed-off-by: Martin Perina <mperina@redhat.com>