3. webadmin: Added appropriate AppErrors message for change password URL

This patch addds appropriate app errors

Bug-Url: https://bugzilla.redhat.com/1053601
Change-Id: Ic843923f3c97f69b6faa82d85ff776e97282db34
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>