debuginfod: add --listen-address option

debuginfod: add --listen-address option

Use MHD_OPTION_SOCK_ADDR to bind the http listen socket to a single address.
The address should be an IPv4 or IPv6 address configured on the system:
    --listen-address=127.0.0.1
    --listen-address=::1
    --listen-address='LOCAL_IPv4|IPv6_ADDRESS'
As debuginfod does not include any security features, a listen on the
localhost address is sufficient for a HTTP/HTTPS reverse-proxy setup.

Signed-off-by: Michael Trapp <michael.trapp@sap.com>