P2p: do not use ipv4 discovery in sandboxed scripts (closes 477)

This partially revert f51b8ad9.

We should way until a proper configuration-less discovery mechanism
based on ipv6_multicast is re-enabled before to use it by default in
the tests.
31 jobs for revert_ipv4_discovery_in_sandbox_scripts in 7 minutes and 26 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Build
passed #167181161
gitlab-org
build

00:02:30

passed #167181160
gitlab-org
check_indentation

00:00:49

passed #167181158
gitlab-org
check_opam_deps

00:01:37

 
  Test
passed #167181180
gitlab-org
test:basic.sh

00:01:24

passed #167181179
gitlab-org
test:client_alpha:vote

00:01:31

passed #167181181
gitlab-org
test:contracts.sh

00:01:18

passed #167181183
gitlab-org
test:contracts_macros.sh

00:01:34

passed #167181184
gitlab-org
test:contracts_mini_scenarios.sh

00:01:24

passed #167181182
gitlab-org
test:contracts_opcode.sh

00:01:57

passed #167181166
gitlab-org
test:crypto

00:01:11

passed #167181164
gitlab-org
test:data_encoding

00:00:35

passed #167181189
gitlab-org
test:documentation

00:02:46

passed #167181186
gitlab-org
test:inject.sh

00:01:21

passed #167181190
gitlab-org allowed to fail
test:linkcheck

00:04:30

passed #167181192
gitlab-org
test:micheline

00:00:56

passed #167181185
gitlab-org
test:multinode.sh

00:01:46

passed #167181176
gitlab-org
test:p2p:banned_peers

00:00:59

passed #167181168
gitlab-org
test:p2p:io-scheduler

00:01:16

passed #167181174
gitlab-org
test:p2p:ipv6set

00:00:59

passed #167181173
gitlab-org
test:p2p:peerset

00:01:05

passed #167181170
gitlab-org
test:p2p:pool

00:01:17

passed #167181169
gitlab-org
test:p2p:socket

00:00:26

passed #167181188
gitlab-org
test:proto:sandbox

00:01:06

passed #167181172
gitlab-org
test:proto_alpha:lib_client

00:01:05

passed #167181171
gitlab-org
test:proto_alpha:lib_protocol

00:03:10

passed #167181167
gitlab-org
test:shell

00:01:14

passed #167181162
gitlab-org
test:stdlib

00:01:02

passed #167181163
gitlab-org
test:stdlib_unix

00:01:00

passed #167181165
gitlab-org
test:storage

00:01:13

passed #167181191
gitlab-org
test:validation

00:01:02

passed #167181187
gitlab-org
test:voting.sh

00:01:26