Fix remote command execution in common.utils

Fix remote command execution in common.utils

yardstick.common.utils get_port_mac and get_port_ip both raise a
RuntimeError on positive remote command exit status. This commit fixes
them to use the error raising mechanism in yardstick.ssh.SSH.

Additionally, the class AutoConnectSSH class needed an additional
argument to allow the raising mechanism to work correctly.

JIRA: YARDSTICK-1240

Change-Id: Idad125ebbd668cef10a6149eb3e601a437a8d40d
Signed-off-by: Miikka Koistinen <miikka.koistinen@nokia.com>