Bug 9885 Passwords generated by command line scripts are weak

Bug 9885 Passwords generated by command line scripts are weak

This changes the scripts so that:
- in koha-create, the zebra password and mysql passwords are set to 16 character "secure" passwords, ie generated with pwgen -s 16 1
- the patron password is set to a 12 character "memorable" password.

Signed-off-by: Magnus Enger <magnus@enger.priv.no>
Looks good. I did not actually build, install and test new packages,
but i did test pwgen with the new arguments and the changes make
sense.

Signed-off-by: Robin Sheat <robin@catalyst.net.nz>
QA signoff
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>