Add the ability of executing commands on remote hosts
using paramiko SSH client.
- Implement fixture to load ~/.ssh/config file to lookup
for local configuration before connecting to node.
Supported options are:
* User
* Hostname
* Port
* IdentityFile
* ProxyJump
* ProxyCommand
- Iplement fixture to connect a paramiko.SSHClient to
remote host using parameters from ~/.ssh/confing and
tobiko.conf
- Implement remote execution function to implement same
interface than the local one.
Change-Id: I767f7515c1418cff1f42a662bd4dac8d9e7abae9
7d0f8e92f4