Updated openstack/openstack
Project: openstack-dev/devstack  f10d8feca0bc5cf4d707f485bb35ecefa9e97560
null
Clarify deprecation of EXTRA_xxx_OPTS

The various EXTRA_xxx_OPTS variables will be removed in the Juno
development cycle, change the README to reflect the new way for
the Neutron variables.

Change-Id: Ic84da4a9b5a83e66cf0b57d643a87691f15517f0