updating bgpingest suites to support openconfig for carbon

updating bgpingest suites to support openconfig for carbon

the support of openconfig in carbon happenes on getting the content
for PUT(or any other rest) messages inside TemplatedRequests

in the csit/variables/bgpuser|bgpingest are already direcotries such as
bgp_peer or bgp_peer.boron. TempletedRequests will take the rest requests
contetnt from appropriate directory. For default directories (applied for
carbon) openconfig is used. For directory.B|Be netconfconnector is used.

Simple change of ConfigViaRestonf towards TempletedRequests makes the suite
ready for openconfig.

Change-Id: I99cd2be0bf94b4234473af5f38e654c5bbaa9a9e
Signed-off-by: Peter Gubka <pgubka@cisco.com>