sepolicy: Cache the value of is_selinux_enabled() to work around bug #815
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This fixes a regression from:
#797
which is really due to an underlying bug in libselinux which
we're working around:
http://marc.info/?l=selinux&m=149323809332417&w=2
We drop the per-policy instance variable, since the SELinux state
is really per-kernel.