Added mounting and umounting /target

It turned out that in some cases it is necessary to umount
all mount points which are connected to a particular disk
before creating other partitions on that disk.

Change-Id: I43a2de132415d026a6dc096e2b25ce0ab4cce915
Closes-Bug: #1297792
Rewrite rabbit init scripts

This scripts are takes from packages and retry loops
are added. When booted nodes will wait for the primary
node goes up and then will connect to the cluster.

Closes-bug: 1308455
Change-Id: I6748577e71c0e2be10a9298b9691c335e5be45c5
Merge "Added mounting and umounting /target" into stable/4.1