userportal, webadmin: rename patternfly-custom-hacks.css

Rename patternfly-custom-hacks.css to ovirt-patternfly-compat.css
to avoid confusion. This file is not part of PatternFly. It is
a compatibility layer.

Change-Id: Ifcc0071fb5703e382ac7fffeed634b8132fbb1be
Signed-off-by: Greg Sheremeta <gshereme@redhat.com>