webadmin: sort cluster policy list

first order cluster policies by pre-defined then lexicographically.

Change-Id: I46c5de299ea7d4d0cd53dc6538d25b8f7337d0e6
Bug-Url: https://bugzilla.redhat.com/994719
Signed-off-by: Gilad Chaplik <gchaplik@redhat.com>