Log the result of command in get_nic_name_by_ip

We need to know the result of the command run
in get_nic_name_by_ip to see what is getting parsed
since we are returning the empty string in some
cases which results in an error because
/var/run/udhcpc..pid does not exist in the guest.

Change-Id: Ie15ac360a7fd384583607d5bf1d8ce7a3d2c3576
Related-Bug: #1813198
1 file changed