Draft: monitor: use httpd -k start to handle stale PID files
Instead of using a custom shell wrapper script to detect and remove
stale PID files before starting httpd, use the built-in -k start
option of Apache httpd which properly handles this case.
When httpd is invoked with -k start, it checks if the process
identified by the PID file is actually running before deciding
whether to start. If the PID file contains a stale PID (process not
running or running a different program), httpd will start normally.
This reverts the approach from ee35dc1c which added a custom wrapper script, and replaces it with the standard Apache mechanism.