use cm_api first_run as the last step to start cdh cluster

Cloudera CM_API library has a function ApiCluster.first_run. This function will help CM to finish steps to prepare and start properly configured services. E.g., for Yarn service, first_run will create Yarn job history directory, then create Yarn NodeManager remote application log directory, and start Yarn service. Currently in CDH plugin those steps is hard-coded in deploy.py step-by-step instead of using first_run. We think it is necessary to change to use first_run, for first_run leaves the work to CM, avoids possible future changes in CM, and protects code consistency in sahara CDH plugin.