Use 'exec' to substitute calling process instead of forking.
Use 'exec' to substitute calling process instead of forking.

Restarting the process does not kill the child process, so new configuration are not loaded unless someone kills the child process manually.
Proposed change fixes the restarting issue.

Former-commit-id: 62e5a80f604c1d5f109da5b259dca094c8eae578
Webtrends/rundeck,nilroy/rundeck,scottymarshall/rundeck,nilroy/rundeck,nilroy/rundeck,scottymarshall/rundeck,scottymarshall/rundeck,Webtrends/rundeck,Webtrends/rundeck