Modify VTN Test files and VTNMgr Keyword file to use RESTCONF instead of the REST API
* Renamed the below files name to functionality specific
010__vtn_manager.robot -> 010__vtn_vbridge_portmapping_test.robot (VTN_Mgr_OF10 and VTN_Mgr_OF13)
010__restconfig_vtn_manager.robot -> ../VTN_Mgr_OF13/010__flowcondition_test.robot
* The above test files is modified to work for RESTCONF specs and remaining robot files tests are disabled with Tags exclude
* Modify VtnMaKeywords.robot library file according to RESTCONF specs
* Tags exclude in robot files will be removed once each test file is modified and tested for RESTCONF specs.
Change-Id: Idcfea115300f0651a4a58d9f5a6eb117a78b1182
Signed-off-by: Karthik.S <siva-karthik@hcl.com>