pkd: specify HostKeyAlgorithms for OpenSSH client
As of OpenSSH 6.9, support for ssh-dss host keys is disabled by default
at runtime. Specify an explicit -o HostKeyAlgorithms in the pkd tests
to explicitly enable each host key type being tested, including ssh-dss.
Signed-off-by: Jon Simons <email@example.com>
Reviewed-by: Andreas Schneider <firstname.lastname@example.org>