[NEXUS-5873] Automatically enable RuthAuth realm when capability is created/enabled

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge remote-tracking branch 'origin/master' into NEXUS-5873-auto-enable-ruthauth-realm
Merge pull request #119 from sonatype/NEXUS-5873-auto-enable-ruthauth-realm

REVIEW: [NEXUS-5873] Automatically enable RuthAuth realm when capability is created/enabled