Add maximum microversions for each releases
Add maximum microversions for each releases

Since openstack-dev mail[1], the note of maximum microversions of each
release seems useful for operators and users because many clouds are
deployed with certain release, not master branch.
Then this patch adds maximum microversions to the history note.

The links [2] and [3] will help reviewing to check each microversion.

[1]: http://lists.openstack.org/pipermail/openstack-dev/2016-January/083922.html
[2]: https://github.com/openstack/nova/blob/stable/liberty/nova/api/openstack/rest_api_version_history.rst
[3]: https://github.com/openstack/nova/blob/stable/kilo/nova/api/openstack/rest_api_version_history.rst

Change-Id: Ia17b2ff5e3e21da79232baf298d45f016762ccb0

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