Change build and bootstrap procedure

* add build action to build binary packages
* remove conflicting packages on install phase
* process rhel.yaml to get required RPM package names
* allow including only /usr directory to packages

Build action is run as root after prepare action.

Change-Id: I6beec02e1c6ff48ec24a6ae382aae0193c1af95f
Fixes: bug #1193088
Fixes: bug #1193085