Regression test portability: 127.0.0.0/8

On Linux, the host answers any address in  127.0.0.0/8
On NetBSD, any address must be configured with ifconfig lo0 alias before
it can be used.

BUG: 1129939
Change-Id: Ia628716c104d955817a95e0c5e04ead924bb4847
Signed-off-by: Emmanuel Dreyfus <manu@netbsd.org>
Reviewed-on: http://review.gluster.org/8483
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Harshavardhana <harsha@harshavardhana.net>
Tested-by: Harshavardhana <harsha@harshavardhana.net>