Set a bigger TIMEOUT_SCALING_FACTOR value for migration tests
Set a bigger TIMEOUT_SCALING_FACTOR value for migration tests

This should help avoid timeouts on CI.

Related-Bug: #1216851

Change-Id: Ic5b2b75e1d8bc73e49b8e7944ae802a64041cb7c

gooddata/openstack-nova,Juniper/nova,rajalokan/nova,gooddata/openstack-nova,klmitch/nova,gooddata/openstack-nova,vmturbo/nova,vmturbo/nova,cloudbase/nova,cloudbase/nova,jianghuaw/nova,mikalstill/nova,sebrandon1/nova,Juniper/nova,openstack/nova,gooddata/openstack-nova,mikalstill/nova,jianghuaw/nova,alaski/nova,klmitch/nova,rajalokan/nova,alaski/nova,hanlind/nova,sebrandon1/nova,rahulunair/nova,mahak/nova,jianghuaw/nova,klmitch/nova,vmturbo/nova,mikalstill/nova,Juniper/nova,phenoxim/nova,Juniper/nova,vmturbo/nova,openstack/nova,rahulunair/nova,mahak/nova,klmitch/nova,mahak/nova,openstack/nova,jianghuaw/nova,rajalokan/nova,rajalokan/nova,hanlind/nova,hanlind/nova,cloudbase/nova,rahulunair/nova,phenoxim/nova,sebrandon1/nova