Administration passwords containing most special characters are broken

Merging !47 (merged) introduced a regression: when entering a password containing any special character but @%+=:,./- the actual password will be single-quoted. So e.g. a! → 'a!'.

This is because we run shlex.quote() on the password we feed into mkpasswd. We should just drop that.

Edited Jun 30, 2020 by segfault

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