Add description to policies in keypairs.py
Add description to policies in keypairs.py

blueprint policy-docs

Change-Id: I4a36b76626ca580522c953170327478c72be9556

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