Check the remote repository is existing on the openwhisk by sending the GET request. If it exists, return TRUE, doesn't exist, return FALSE
faasr_register_workflow_openwhisk_check_exists(ssl, action, server, faasr)a logical value; if exists, return TRUE, doesn't exist, return FALSE
SSL CA check; for the SSL certificate: FALSE
a string for the target action: /actions, /triggers, /rules
a string for the target server
a list form of the JSON file