Bug 10149 - koha-restart-zebra error handling (rewording)

Bug 10149 - koha-restart-zebra error handling (rewording)

koha-restart-zebra now
- Checks the instance exists.
- Checks the instance is enabled.
- Checks if the zebra daemon is already running.

Regards
To+

Edit:
- changed some wording problems.
- fixed an error in parameter validation

Sponsored-by: Universidad Nacional de Córdoba
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Mason James <mtj@kohaaloha.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>