Remove dns lookup issued for each hostnames.
Remove dns lookup issued for each hostnames.

Signed-off-by: Harshavardhana <harsha@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 563 (glusterfs-volgen: can't handle multiple network interfaces)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=563

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster