MINIFICPP-1421 - Update C2Jstacktest: add sync variable, remove always fulfilled log matching
MINIFICPP-1421 - Update C2Jstacktest: add sync variable, remove always fulfilled log matching

Signed-off-by: Arpad Boda <aboda@apache.org>

This closes #953

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