Redmine#5558: Remove SELinux-related bundles

See https://dev.cfengine.com/issues/5558

Tested 3.6.0 GA on RHEL 7.0, 6.5 and 5.10 Hub with some clients bootstrapped. It looked like these bundles were unnecessary. The package seemed working OOTB. SELinux no more complained on apache, postgresql, etc. (used to complain on mongodb.)