spec: Move /lib files to /usr/lib

Fedora 19+ and EL7 stopped using /lib which is now a symbolic link to
/usr/lib and deprecated installing files to /lib.

We store the following files in /lib:
 * systemd configs:
 Not present on EL6, if using systemd always install to /usr/lib.

 * udev rules:
 Checks if current version is EL6 and installs to old or new path
 accordingly.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1121494
Change-Id: I091174b7126ad3196c1670803eb16a5b5591a89a
Signed-off-by: Dima Kuznetsov <dkuznets@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30869
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>