HPCC-12786 Ip address from scripts to match ifconfig

@garonsky, @AttilaVamos please review minor changes to scripts.

I found get_ip_address did not always return what should be the default/correct interface, especially
when it was specified as '*' in the conf file.
util.py did not always work correctly on an IB cluster when Ethernet word is not present.

Signed-off-by: Mark Kelly <mark.kelly@lexisnexis.com>