server: Don't include colon in _genpasswd().

Seems that the robot is not able to cope with ":" in passwords, so let's
not use them when generating passwords.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Bump version to 0.4.1.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>