Added selinux policy for el6 slaves

Whithout it the slaves are not able to run engine-setup and let it
install packages. Fedora hosts do not seem to have that limitation.

Also added vim swapfiles to the gitignore

Change-Id: Ifdd61d7df957aa88ea734339e6b8a3733a855cfd
Signed-off-by: David Caro <dcaroest@redhat.com>