Support SSH Key pair with signed public key

Merge pull request #11 from mobiledgex/sshkeypair

Support for SSH Key pair with signed public key

Add SSH KeepAlive interval

Fixes EDGECLOUD-3354: Terminal connection to AppInst times out fast:

Cache SSH client to reuse if for multiple connections

Cache client to reuse SSH connection
* Added two new APIs to client interface : StartPersistentConn() and StopPersistentConn()

Multi-Hop support for Shell

v0.0.7

Merge pull request #7 from mobiledgex/addhopshell

Implement OutputWithTimeout

Add OutputWithTimeout to Client interface.
OutputWithTimeout runs an Output command with a custom timeout for the initial Dialing of the remote system.

Implement AddHop

Merge pull request #5 from mobiledgex/remote-output

Refactor for multiple SSH hops

include proxy ssh

Merge pull request #3 from mobiledgex/proxy-ssh

Proxy SSH

v0.0.3: Merge pull request #2 from mobiledgex/ssh-leak

SSH connection leak

Remote shell work

v0.0.2

Merge pull request #1 from mobiledgex/leak

Initial release

Merge pull request #6 from nanobox-io/add-license-1

Create LICENSE