Expose ParamikoHost.get_user_key as part of the interface, usable
without a ParamikoHost instance. This lets us check if a host has
the keys that we need to use the class, and fall back to SSHHost
instead if this isn't true.

Risk: Low
Visibility: Having paramiko installed by no usable SSH keys is okay.

Signed-off-by: John Admanski <jadmanski@google.com>



git-svn-id: http://test.kernel.org/svn/autotest/trunk@2407 592f7852-d20e-0410-864c-8624ca9c26a4
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