Add description to policies in server_metadata.py
Add description to policies in server_metadata.py

blueprint policy-docs

Change-Id: I8b209dea3d033374dcd30e952bedd09e6016fdf7

klmitch/nova,rajalokan/nova,klmitch/nova,rajalokan/nova,klmitch/nova,mikalstill/nova,mahak/nova,mahak/nova,Juniper/nova,vmturbo/nova,rahulunair/nova,gooddata/openstack-nova,Juniper/nova,mikalstill/nova,rahulunair/nova,klmitch/nova,openstack/nova,vmturbo/nova,phenoxim/nova,openstack/nova,vmturbo/nova,vmturbo/nova,rajalokan/nova,gooddata/openstack-nova,gooddata/openstack-nova,Juniper/nova,rahulunair/nova,mikalstill/nova,phenoxim/nova,gooddata/openstack-nova,mahak/nova,openstack/nova,jianghuaw/nova,rajalokan/nova,jianghuaw/nova,jianghuaw/nova,jianghuaw/nova,Juniper/nova