DSA is no longer supported by OpenSSH 7.0, which causes all SCP/SFTP
test cases to be skipped. Using RSA for host authentication works with
both old and new versions of OpenSSH.
Reported-by: Karlson2k
Closes#676
Upstream-commit: effa575fc7f028ee71fda16209d3d81af336b730
Signed-off-by: Kamil Dudka <kdudka@redhat.com>