Actually validate network connectivity on NM MM setup

Ticket: https://progress.opensuse.org/issues/155278

lib/mm_network.pm

@@ -8,6 +8,7 @@ use Exporter;
 
 use testapi;
 use version_utils 'is_opensuse';
+use utils qw(validate_script_output_retry);
 
 our @EXPORT = qw(configure_hostname get_host_resolv_conf is_networkmanager restart_networking
   configure_static_ip configure_dhcp configure_default_gateway configure_static_dns
@@ -237,7 +238,7 @@ sub restart_networking {
         assert_script_run 'nmcli networking off';
         assert_script_run 'nmcli networking on';
         # Wait until the connections are configured
-        assert_script_run 'nmcli networking connectivity check';
+        validate_script_output_retry('nmcli networking connectivity check', m/full/, delay => 3, retry => 5);
     } else {
         assert_script_run 'rcnetwork restart';
     }

lib/utils.pm

@@ -10,7 +10,6 @@ use strict;
 use warnings;
 use testapi qw(is_serial_terminal :DEFAULT);
 use lockapi 'mutex_wait';
-use mm_network;
 use version_utils qw(is_alp is_sle_micro is_microos is_leap is_leap_micro is_public_cloud is_sle is_sle12_hdd_in_upgrade is_storage_ng is_jeos package_version_cmp is_transactional is_bootloader_sdboot);
 use Utils::Architectures;
 use Utils::Systemd qw(systemctl disable_and_stop_service);