BUG:8761 Portmapping fails due to unnecessary hex conversion

BUG:8761 Portmapping fails due to unnecessary hex conversion

  * The VTN coordinator implementation is performing an
  operation to convert the switch ID to hexadecimal and
  then invoking VTN Manager REST API for creating port map.
  * Due to this the portmap creation fails when the logical
  port-id value is greater than nine
  * This was required for VTN in the Li release. But, later
  VTN Manager migrated to MD-SAL, after which this conversion
  was not necessary.

Change-Id: I8d84179442284101fa3b9033ed85c207042f9db0
Signed-off-by: yogalakshmi.pa <yogalakshmi.pa@hcl.com>