[FreeBSD] service resource agent not supported

Configuring a resource, such as "service:hastd" does not work on BSD systems.
Pacemaker expects the RC script to be `/etc/init.d/hastd` instead of `/etc/rc.d/hastd`.

```
Jan 11 15:58:51 bsd1 lrmd[723]: warning: Cannot execute '/etc/init.d/hastd': No such file or directory (2)
Jan 11 15:58:51 bsd1 crmd[726]: error: Unable to retrieve meta-data for (null):heartbeat:hastd
Jan 11 15:58:51 bsd1 crmd[726]: error: No metadata for service::(null):hastd
Jan 11 15:58:51 bsd1 crmd[726]: error: Result of probe operation for hastd on bsd1: Not installed
```

The resource agent should use the `service` command or `/etc/rc.d`.

Locate the service resource agent and trace how it constructs the init-script path for a resource such as service:hastd. Compare the current `/etc/init.d` lookup with the FreeBSD `service` command and `/etc/rc.d`; done means FreeBSD service resources can be configured and probed without the `/etc/init.d` error shown.

Written by the indexing model from the issue text.