can not use DSSKey to login

[Liu Lei]

If i pass a dss key to the method _get_pkey of class sshutils.SSH, it will raise ssh error "Invalid pkey".

in the method, the key is a file obj, it will be read in the "key_class.from_private_key" on the first loop to check rsa key, but nothing will be read from the key on the second loop

def _get_pkey(self, key):
    if isinstance(key, six.string_types):
        key = six.moves.StringIO(key)
    errors = []
    for key_class in (paramiko.rsakey.RSAKey, paramiko.dsskey.DSSKey):
        try:
            return key_class.from_private_key(key)
        except paramiko.SSHException as e:
            errors.append(e)
    raise exceptions.SSHError("Invalid pkey: %s" % (errors))

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/632046

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/632046
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=cc6f877f5d855ca8adde1cb48caf544bcb969c75
Submitter: Zuul
Branch: master

commit cc6f877f5d855ca8adde1cb48caf544bcb969c75
Author: chenhb <email address hidden>
Date: Mon Jan 21 17:49:49 2019 +0800

    Fix the issues of dss key in ssh utils

    It can not load dss key in ssh utils because of the file cursor
    position.

    Change-Id: Id358673e58565cae73ac39d1f11f5e8edeab4e67
    Closes-Bug: #1807870

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/rally 1.4.0 release.