Fix opt descripton for cells.py
Fix opt descripton for cells.py

Removed the following items/sections as per [0]:
- all 'Service which consumes... " sections
- any "Possible values" section if it is only duplicating
the machine readable info in the option definition
- 'Related options' sections that do not contain
any information.

 [0] https://wiki.openstack.org/wiki/ConfigOptionsConsistency

Blueprint centralize-config-options-newton

Change-Id: I6f5fa876c0b411e4b06d2a58cf644334d850d674

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