Fix for murano-enabled environments update

Fix for murano-enabled environments update

As murano uses config injection in settings.py we should
reinject murano settings after openstack-dashboard update.
This patch-set introduces murano check/fix section in update
script.

Small unrelated changes also have been made:

Now script on each node uses `logger` with tag mos_apply_mu to
log messages. This means that output of script from each node
will apear on master-node in

/var/log/remote/$nodename$/mos_apply_mu.log

Also amount of output was reduced. Messages became clearer.
Master IP is a mandatory option now.

Closes-Bug: #1457461

Change-Id: If42004c265e8943365a50a0fc2cb0cf6df82f4a8