BUG 312: Removed legacy RESTCONF draft 01 syntax

Change-Id: I1dab84ae70ef39964ead1b14efd58ae2e3eee087
Signed-off-by: Martin Sunal <msunal@cisco.com>
BUG 388: corrected media type in /operations resource

There were added these media types for /operations resource:
application/yang.operation+json
application/yang.operation+xml
Corrected handling of requests which have empty body and Content-Type has some value or is missing

Change-Id: I148c22c4c6c28d0d13f2b717fe629b42d5c73f70
Signed-off-by: Martin Sunal <msunal@cisco.com>
Additional test for instance-identifier

- test for instance identifier
- correction of ignored test (adding revisions to wrong tests)
- instance identifier with leaflist predicate:
-- serialize codec
-- XML output
-- JSON output

Change-Id: Iae4ee2f2ff3c1b3445958f1d69673df9f56b0e2a
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>
Merge changes Iae4ee2f2,I148c22c4,I1dab84ae

* changes:
  Additional test for instance-identifier
  BUG 388: corrected media type in /operations resource
  BUG 312: Removed legacy RESTCONF draft 01 syntax