use Wants= instead of Requires= for systemd dependencies

If beah-beaker-backend or beah-fwd-backend fails or is restarted, we
still want beah-srv to try and run.

Change-Id: I5753c72942b884f2f4514398ffa269ded0b4b937
build selinux policy on RHEL7 also

Bug: 1149988
Change-Id: Iaa76acd282cd38db1f3dca6c4c4c5d3223e7dd0d
Automatic commit of package [beah] release [0.7.7-1].