Update brg activate and tunnelxconn create DGs

This update adds RestApiCallNode calls to tunnelxconn
create DG to configure xconnect for vCPE VNFs
and fixes order of vxlan tunnel create on brg activate
DG and tunnelxconn create DG. It also converts
tabs to spaces in brg-allotted-resource.json
and tunnelxconn-allotted-resource.json.

Issue-Id: SDNC-164
Change-Id: I72c70762df7f778ab9a8aca2040f5c424eb4dc0d
Signed-off-by: Marcus G K Williams <marcus.williams@intel.com>
Former-commit-id: 90aab828a230896fa60398c3f66f6fee57c73be5