Update muranodashboard installation
Update muranodashboard installation

Since horizon merge into settings file incompatible with running
murano runserver configuration, we decided that it's better to run horizon with
murano dashboard enabled.


This commit updates installation instructions.

Change-Id: Iccd9792b59e144cde27106442a932d811571545f
Related-Bug: #1436282

satish-avninetworks/murano,DavidPurcell/murano_temp,olivierlemasle/murano,DavidPurcell/murano_temp,sajuptpm/murano,openstack/murano,satish-avninetworks/murano,NeCTAR-RC/murano,chenyujie/hybrid-murano,NeCTAR-RC/murano,DavidPurcell/murano_temp,DavidPurcell/murano_temp,olivierlemasle/murano,chenyujie/hybrid-murano,olivierlemasle/murano,NeCTAR-RC/murano,satish-avninetworks/murano,NeCTAR-RC/murano,sajuptpm/murano,satish-avninetworks/murano,openstack/murano,olivierlemasle/murano