Enable password authentication if other authentication methods are also set

[FleischerT]

The issue with password authentication working only when it is set as the only authentication type has been fixed. Since now in the templates it checks for a substring instead of equality.

Furthermore, it is now possible to use an externally created secret for the password file.

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[FleischerT]

@cla-bot check

[cla-bot[bot]]

The cla-bot has been summoned, and re-checked this pull request!

[nineinchnick]

Ah I just noticed #124 is merged, this might not be needed anymore.