Pin maximum API version of microversion
Pin maximum API version of microversion

pin maximum version 2.38 to Newton

Change-Id: I04a0d344d663815715a6d41d8ced6088a4e88ff8

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