HttpEpServer: Add support for OPTIONS requests
HttpEpServer: Add support for OPTIONS requests

Change-Id: I458abe7cf056d9488113608a02d83a1625f85a87

TribeMedia/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements