pki: do not override ca database in packaging

ca database should be created when CreateCA.sh is executed, not by
packaging. As subsequent installations should not override these unless
the ca is recreated.

serial and database should have actually been in /var/lib, but for now
we keep them at /etc.

Change-Id: I288864dbfb2908d4159fdbd44724d4674a1f4eee
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>