Update create_userrc to openstackclient commands

Updated keystoneclient commands in tools/create_userrc.sh
to their openstackclient equivalents.

Change-Id: I03c17cfc9740c3eb257152c95d9c4f021db2c89e
Add driver parameter for PLUMgrid configuration file

PLUMgrid plugin for Neutron supports to load dynamically a back-end driver.
This parameter has been added in the plugin configuration file.

Change-Id: I1698a8fa558841aeb94476bc8c7f103b21f2a2d3
Closes-bug: #1315466
Merge "Add driver parameter for PLUMgrid configuration file"
Merge "Update create_userrc to openstackclient commands"
Merge branch 'master' of https://github.com/openstack-dev/devstack