Bug 13143 - Add a tool to show a Koha's password

 Bug 13143 - Add a tool to show a Koha's password

to test...

1/ run without any args, and get some help
 # koha-passwd
Displays a Koha instance's password.

Usage: /usr/sbin/koha-passwd instancename1 instancename2...

Missing instance name...

2/ run with a bad instance, get an error
 # koha-passwd xxxxx
Unknown instance xxxxx

3/ run with a correct instance, get a password
 # koha-passwd koha1
foofoo69

4/ run with many instances, get many passwords
 # koha-passwd koha1 koha2 koha3
foofoo69
foofoo68
foofoo67

Signed-off-by: Mason James <mtj@kohaaloha.com>

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>