oeqa/utils: sshcontrol: rewrite the SSHControl class
Split the class in two, one to handle the process and the
timeout based on output and one for the actual ssh/scp commands.
The ssh/scp methods now use the same run method.
It does the same thing as before but:
- it looks cleaner.
- adds support for using a different user than root
- optionally, raises an exception when exit code != 0
(that's useful for code outside of tests, where you wouldn't want
to check the return code every time as the tests do)
Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
