Add logging.conf to gitignore
Add logging.conf to gitignore

Sometimes user wants to specify it's own logging config.
But now it should be excluded from commit all the time.

Change-Id: I323375c7b8e49658fd96a001bd6b8a3dfd675031

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