modules/services/networking/ssh/sshd.nix: added new boolean options usePAM and passwordAuthentication
modules/services/networking/ssh/sshd.nix: added new boolean options usePAM and passwordAuthentication

Setting both of these options to 'false' configures the OpenSSH daemon to
reject password authentication, i.e. users must have an appropriate key in
~/.ssh/authorized_keys in order to be able to log in.

svn path=/nixos/trunk/; revision=27732

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