renamed a unit test data file - especially from 'valid' to 'postponed' as it is rendering of a conv op structure
Merge pull request #177 from telefonicaid/bug/xsd_failure_in_ngsi9.discoverContextAvailabilityResponse.ok.valid.xml

xmlCheck error detected by Jenkins
temporal commit to merge with develop
fixed the harness test jsonParse/empty_payloads.test
fixed the harness test jsonParse/empty_payloads