Support for ExtraConfig to tuskar cli deployment
Support for ExtraConfig to tuskar cli deployment

This patch adds support to set the [role]:ExtraConfig plan parameter to
OVERCLOUD_EXTRA_CONFIG when the script is called with --tuskar.
agroup/instack-undercloud,rdo-management/instack-undercloud,dpkshetty/instack-undercloud,eprasad/instack-undercloud,dmsimard/instack-undercloud,rdo-management/instack-undercloud,bcrochet/instack-undercloud,dpkshetty/instack-undercloud,bcrochet/instack-undercloud,eprasad/instack-undercloud,dmsimard/instack-undercloud,agroup/instack-undercloud