MINIFICPP-1440 PublishKafka processor's "security protocol" should have allowable values
MINIFICPP-1440 PublishKafka processor's "security protocol" should have allowable values

This closes #961

Signed-off-by: Marton Szasz <5e37528a44f6577542b32ebfad716b90b77491f5@gmail.com>

dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp