now ssh plugin 'respects' .ssh/config user 

This is a small annoyance, but a few people use user overrides in .ssh config, which don't work cause the ssh plugin always specifies user. I made a special case (for when user is the same as current user), which now will respect the .ssh/config and should not break when overriding to a different user.

Signed-off-by: Brian Coca <briancoca+dev@gmail.com>