debuginfod: Include "IPv4 IPv6" in server startup message

debuginfod: Include "IPv4 IPv6" in server startup message

At startup debuginfod prints a message indicating the port which the
server is listening to.  Prior to commit 4e4082be03 this message would
include "IPv4" and/or "IPv6"

    [...] (48671/48671): started http server on IPv4 IPv6 port=8002

As of commit 4e4082be03 the IP versions have been removed from this
message.  This change can cause issues in any applications that
parse the message for this information.  Fix this by adding
"IPv4 IPv6" back to the message.

Signed-off-by: Aaron Merey <amerey@redhat.com>