Add XML Schema validation scripts to [OpenEspiIntegrationTests] API test steps expecting HTTP Status code of 200
Add XML Schema validation scripts to [OpenEspiIntegrationTests] API test steps expecting HTTP Status code of 200

RonPasquarelli/OpenESPI-GreenButtonCMDTest,dfcoffin/OpenESPI-GreenButtonCMDTest,MartyBurns/OpenESPI-GreenButtonCMDTest,RonPasquarelli/OpenESPI-GreenButtonCMDTest,energyos/OpenESPI-GreenButtonCMDTest,energyos/OpenESPI-GreenButtonCMDTest,dfcoffin/OpenESPI-GreenButtonCMDTest,MartyBurns/OpenESPI-GreenButtonCMDTest