thrukadmin.passwd file shows bytestring on Bionic

[Drew Freiberger]

When installing thruk-master on a bionic system, the thrukadmin password ends up having the byte-string wrapper and \n encoded as part of the actual password.

ubuntu@juju-91feaf-2:~$ sudo more /var/lib/thruk/thrukadmin.passwd
b'JG2CrQzRZB9Csw3U\n'
ubuntu@juju-91feaf-2:~$

When logging into the web interface, you then must include the b' and \n' parts of this password to login.

This variable should be decoded properly in the code when python3 is the default python version.

[Drew Freiberger (afreiberger)]

also happens on fresh trusty deployments.

[Diko Parvanov (dparv)]

+ also happens on xenial

[Diko Parvanov (dparv)]

Seems like the password generation was broken, not the actual writing to the file. Changed the pwgen binary with native python libraries to generate the password. Proposed fix.