Extend FakeCryptoCertificate.cert_not_valid_after to 2 hours
Extend FakeCryptoCertificate.cert_not_valid_after to 2 hours

Someone reported this test failing on a slow CI system where
it takes 1.5 hours for their stuff to run. It doesn't seem to
matter what our fake mock expiration time is, so bump it to 2
hours.

Change-Id: I0121fe9da5831d6186bf7954271b79a8b3a60eba
Closes-Bug: #1548724

openstack/nova,vmturbo/nova,gooddata/openstack-nova,cloudbase/nova,jianghuaw/nova,klmitch/nova,sebrandon1/nova,BeyondTheClouds/nova,CEG-FYP-OpenStack/scheduler,gooddata/openstack-nova,alaski/nova,jianghuaw/nova,mahak/nova,gooddata/openstack-nova,gooddata/openstack-nova,rahulunair/nova,bigswitch/nova,BeyondTheClouds/nova,BeyondTheClouds/nova,openstack/nova,jianghuaw/nova,mahak/nova,vmturbo/nova,alaski/nova,phenoxim/nova,rajalokan/nova,cyx1231st/nova,hanlind/nova,klmitch/nova,hanlind/nova,sebrandon1/nova,hanlind/nova,vmturbo/nova,bigswitch/nova,NeCTAR-RC/nova,rahulunair/nova,rajalokan/nova,sebrandon1/nova,zhimin711/nova,Juniper/nova,cernops/nova,cloudbase/nova,CEG-FYP-OpenStack/scheduler,Juniper/nova,NeCTAR-RC/nova,phenoxim/nova,rajalokan/nova,mikalstill/nova,Juniper/nova,mahak/nova,cernops/nova,openstack/nova,cyx1231st/nova,rahulunair/nova,cernops/nova,vmturbo/nova,klmitch/nova,jianghuaw/nova,rajalokan/nova,Juniper/nova,mikalstill/nova,mikalstill/nova,klmitch/nova,zhimin711/nova,cloudbase/nova