This is to fix BZ  699809 - Convert certificate system to use systemd

https://bugzilla.redhat.com/show_bug.cgi?id=699809

This patch has most of what is fneeded

There is some extra stuff in the spec file for pki-core for symkey -- I needed
this just to get a build going.  I will remove this on commit.  The fix for
this issue will be provided by mharmsen in a separate bug.

Whats missing:

Some logic in spec files to upgrade existing instance.  Will add that in a
separate patch.

Please review and ack.
Thanks, 
Ade