Explicitly set bind_ip in Swift server config files
Explicitly set bind_ip in Swift server config files

Currently, the Swift proxy, object, account, and container servers bind
to IPv4 address 0.0.0.0 by default. In the case of a user setting
SERVICE_IP_VERSION=6 in their local.conf file, these Swift servers still
listen on 0.0.0.0 instead of ::, which causes a ./stack.sh run to fail.

This change explicitly sets the bind_ip variable in the Swift server
config files so that the servers bind to either 0.0.0.0 (when
SERVICE_IP_VERSION != 6) or :: (when SERVICE_IP_VERSION == 6).

This patch is related to the following patch for devstack IPv6 support:
    https://review.openstack.org/#/c/192329

Change-Id: Ie268c6daf5374e67ef8710a731c3af50ffdb821e

vsham20/devstack,pombredanne/devstack,TwinkleChawla/devstack,ozamiatin/devstack,avvocatodemarchis/devstack,samgoon/devstack,varunarya10/devstack,bswartz/devstack,parul24/devstack,Mahito/devstack,bq-xiao/devstack,herrsechs/devstack,nawawi/openstack,NaokiMiyata/devstack,costingalan/devstack,ozamiatin/devstack,thomasem/devstack,TwinkleChawla/devstack,vsham20/devstack,openstack-dev/devstack,HPCHub/devstack,dirkmueller/devstack,mmasaki/devstack,pacinete/devstack,pczerkas/devstack,mmasaki/devstack,dirkmueller/devstack,richliu/devstack,herrsechs/devstack,olivierlemasle/devstack,noironetworks/devstack,mc2014/devstack,vishnugonela/devstack,bswartz/devstack,vishnugonela/devstack,richliu/devstack,group-policy/devstack,NaokiMiyata/devstack,flavio-fernandes/devstack,nawawi/openstack,bigswitch/devstack,atulpatil301/devstack,mssumanth/devstack,dtroyer/devstack,costingalan/devstack,prithivm/branch01,mssumanth/devstack,atulpatil301/devstack,bigswitch/devstack,noironetworks/devstack,HPCHub/devstack,eharney/devstack,liuquansheng47/devstack,pczerkas/devstack,samgoon/devstack,pombredanne/devstack,bq-xiao/devstack,pacinete/devstack,group-policy/devstack,olivierlemasle/devstack,dtroyer/devstack,parul24/devstack,flavio-fernandes/devstack,liuquansheng47/devstack,thomasem/devstack,mc2014/devstack,eharney/devstack,prithivm/branch01,varunarya10/devstack,openstack-dev/devstack,upadhyay-prashant/devstack,avvocatodemarchis/devstack,upadhyay-prashant/devstack,Mahito/devstack