MINIFI-161: Provide command and arguments as attributes in ExecuteProcess
MINIFI-161: Provide command and arguments as attributes in ExecuteProcess

This closes #29.

Signed-off-by: Aldrin Piri <8746015474cd01110181ed51735247560fd08de4@apache.org>

phrocker/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,apiri/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,apiri/nifi-minifi-cpp,brosander/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,apiri/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,reynoldsjohn/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,reynoldsjohn/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,brosander/nifi-minifi-cpp,reynoldsjohn/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,apiri/nifi-minifi-cpp,apiri/nifi-minifi-cpp,brosander/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,jdye64/nifi-minifi-cpp