Skip policy module re-link when only setting booleans.

Since booleans are only set, not added/removed, we do not need to re-link
modules when setting them.  We can instead just take the existing binary
policy and mutate it for the new values.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Merge branch 'master' of github.com:fedora-selinux/selinux