Copr Backend changes

• minimize redis traffic for looping over pending-jobs (issue#902)
• batch delete builds into a single action (issue#688)
• admin opt-out createrepo after build-deleting
• fix wrong message validation class
• refine cleanup_vm_nova.py
• depend on copr-messaging

Copr Frontend changes

• admin permission check in 'can_build_in()' (issue#970)
• better link to builder-live.log (issue#941)
• hide unlisted projects from homepage in RSS
• build srpm first
• fixes traceback with invalid chroot name (issue#810)
• fix public dump for login to work after re-import (issue#912)
• optimize frontpage and fix recent builds page (issue#937)
• batch delete builds into a single action (issue#688)
• optimize /backend/pending-jobs/ json rendering
• monitor page should not show builds from PR (issue#839)
• unify "repos" field description for chroot/project
• add support for length of pending/running tables (issue#709)
• fix traceback on build delete (issue#822)
• remove records limit for running/pending/importing stats pages (issue#893)
• fix error with sorting pending/running table by project name (issue#901)
• fix GDPR user data deletion (issues#889,#890)
• adding better time representation for build detail (issue#860)
• un-pin projects when deleting them (issue#895)
• fix module state and show it on the module detail page (issue#607)

Copr common change

• enhanced ModuleStatusEnum (issue#607)