IMPALA-6837: allow multiple networks for distcc server
IMPALA-6837: allow multiple networks for distcc server

Testing:
Tested the script on Ubuntu 14.04 and CentOS 6 servers to confirm
that it resulted in a working configuration.

Change-Id: I6d49786b4f6e9c3bfab244e63620a62b2ae4dd64
Reviewed-on: http://gerrit.cloudera.org:8080/10029
Reviewed-by: Philip Zeyliger <3ba3974e96044dcde818e6310ed799abe10671d4@cloudera.com>
Tested-by: Tim Armstrong <2f8e34250f03a653da3dc27f7ec203eafdde80fc@cloudera.com>

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala