Delete jobs for deprecated Murano repositories

Following Murano repositories were deprecated:
* murano-conductor
* murano-common
* murano-repository
* murano-metadataclient

Check and gate sections in layout.yaml we marked as noop for these repos.

Change-Id: Ibedf6acf40d0781c79f119a695103807ea41331d
Merge "Delete jobs for deprecated Murano repositories"