Bugs correction in Portmapping

Bugs correction in Portmapping

- Modify iteration for getting circuitpacks with srg number.
- Modify OpenRoadmInterfaces constants.
- Modify Portmapping class to add deleteMapping data function. This
function was already in Renderer maven project on master branch, but
was deleted in common maven project on change ATT-Sandbox 'Renderer and
OLM update' https://git.opendaylight.org/gerrit/#/c/66651/.

Co-authored-by: Christophe Betoule <christophe.betoule@orange.com>
Co-Authored-By: Dhruv Bhardwaj <db929a@att.com>
Co-Authored-By: Shweta Vachhani <sv111y@att.com>
Change-Id: If5833b306d00a6c140da665d2e8c69a2a7c69ac4
Signed-off-by: Martial COULIBALY <martial.coulibaly@gfi.fr>