Update all_in_one.sh

According to this procedure:
https://2600hz.atlassian.net/wiki/display/Dedicated/via+RPM

You need to set the hostname in /etc/kazoo/kamailio/local.cfg
Merge pull request #12 from shadowym/patch-1

Updated all_in_one.sh to set hostname in /etc/kazoo/kamailio/local.cfg. Thanks for contributing!