Improve the help text for the network options (1)
Improve the help text for the network options (1)

The previous commit moved all the options from nova/network/manager.py
to a central location in nova/conf/network.py. This commit adds
additional help text to those options. Because of the large number of
options, the improved help text will be split into several patches; this
is patch 1 of 4.

Blueprint centralize-config-options-newton

Change-Id: I995361157f185a6e03c63e1db858035eb1a31b37

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