oeqa/utils/qemurunner: tweak console bootparam and ip command

oeqa/utils/qemurunner: tweak console bootparam and ip command

Sync serial baud rate with default inittab which should
help with apparent boot fails. Also keep a console on tty1.

Also we shouldn't assume eth0 it the right interface.
(systemd images can rename interfaces to something else).

(From OE-Core rev: d5620c0b6782b88f3e6de97b1ddadcf21207fc57)

Signed-off-by: Stefan Stanacar <stefanx.stanacar@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>