lib/oeqa/utils: qemurunner: save host IP address

lib/oeqa/utils: qemurunner: save host IP address

Save host IP address to host_ip.
Read /proc/PID/cmdline on host to look for IPs of target and host;
instead of running 'ps'.
Also removed some extra empty lines from file.

(From OE-Core rev: 1fcf10db10fa36430e37c95c9fee27197e73f7a5)

Signed-off-by: Mihai Lindner <mihaix.lindner@linux.intel.com>
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>