Changelog:
=========
[Feature] #2125: (also re: #2054) Add a transport_factory kwarg to
SSHClient.connect for advanced users to gain more control over early
Transport setup and manipulation. Thanks to Noah Pederson for the patch.
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>