1) sed was not in deps, so it was implicit usage
2) remove grep as dep

When unit_path is sent to sed to workaround some chars in path,
the escaped characters was decoded by printf and characters
like \x2d were substitued by -, leading to an invalid path.

Error was:
```
$ checkservice
Error:: Unable to find pid file for openvpn-client@vpn.seblu.net.service.
```

- move code to bash function
- use uppercase for global vars
- drop dbus restart code when updated
- split broken maps and dbus lookup
- change coloring code

- more generic (not only for restart)
- use local vars
- infinite loop protection

There is probably an infinite loop in the code. When it happen display an error

do not quickly exit when no service to restart, in order to diplay failed services

No regex in what we grep, free speedup

This allow to get usage without running checkservices as root