dtestx: update IB extension example test with new v2.0.9 features

dtestx: update IB extension example test with new v2.0.9 features

Add support for new IB extensions for CM and AH resource cleanup.
Check for v2.0.9 and call dat_ib_ud_cm_free after connection
establishment and dat_ib_ud_ah_free after all data has been
transfered on UD endpoints.

Also add socket based address exchange to eliminate the need
to include lid and qpn parameters on the client side.

Change the multiple EP mode to send from EP 0 to EP[0-3] on
server side and EP[0-3] to EP[0-3] on client side.

Signed-off-by: Arlin Davis <arlin.r.davis@intel.com>