webserver: listen by default to IPv6 socket
webserver: listen by default to IPv6 socket

Former-commit-id: dba5f2ffa1fef9af19edd34f10f47e633556e37f [formerly f77475efc0d64c3540a91194be1b0c06a37a82d4]
Former-commit-id: 6203b51766b3719d45fff2065c97cb6c1b7e3798
torhve/ivar2,haste/ivar2,torhve/ivar2,torhve/ivar2