Checks if update-rc.d (Ubuntu) or chkconfig (RHEL) should be used.
Adds basic bin path search for those binaries
Adds 'enable' and 'disable' options for 'enable' command since it's the
arguments that update-rc.d uses (this might be somewhat confusing to
have a command line with 'enable=enable', but probably mkes sense for
Ubuntu users).
Allows use of mixed case for 'list' and 'state' commands.
When running the service module via sudo, `$PATH` didn't contain `/sbin`,
so the service binary couldn't be found. This just runs `/sbin/service`
directly. Output is spewed to stderr on error.
Added `list=status` to include the output of `service <cmd> status`.
module vs command module for restarting. May be some bugs and requires the service to implement 'status' -- and probably some better error handling (i.e. return JSON with "failed" element if failed).
Improvements welcome.
