Factor common SSH logic into a new flavor.

Change-Id: I3e9acc3f8e2690169b3c76f9aec1ac22f6dfc93a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/205620
Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
9 files changed