fix(multinetwork): remove second network interface configuration

After multiple hard reboots a node eventually loses connection to all other nodes in the cluster.
After node reboot, 2nd interface isn't functioning.
Found that our `sdcm.provision.aws.utils.configure_eth1_script` re-configure the second network interface and it causes
to lost connection.
Actually with using existing and configured network interface we do not need this eth1 configuration script any more.

Fixes: scylladb#8553

sdcm/provision/aws/configuration_script.py

@@ -11,7 +11,7 @@
 #
 # Copyright (c) 2021 ScyllaDB
 
-from sdcm.provision.aws.utils import network_config_ipv6_workaround_script, configure_eth1_script
+from sdcm.provision.aws.utils import network_config_ipv6_workaround_script
 from sdcm.provision.common.configuration_script import ConfigurationScriptBuilder
 
 
@@ -27,8 +27,6 @@ def _wait_before_running_script(self) -> str:
 
     def _script_body(self) -> str:
         script = super()._script_body()
-        if self.aws_additional_interface:
-            script += configure_eth1_script()
         if self.aws_ipv6_workaround:
             script += network_config_ipv6_workaround_script()
         return script

sdcm/provision/aws/utils.py

@@ -283,80 +283,6 @@ def network_config_ipv6_workaround_script():
     """)
 
 
-def configure_eth1_script():
-    return dedent(r"""
-        if grep -qi "ubuntu" /etc/os-release; then
-
-            ETH1_IP_ADDRESS=`ip route show | grep eth1 | grep -oPm1 'src \K[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*'`
-            ETH1_CIDR_BLOCK=`ip route show | grep eth1 | grep -oPm1 '\K[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*/[0-9]*'`
-            ETH1_SUBNET=`echo ${ETH1_CIDR_BLOCK} | grep -oP '\\K/\\d+'`
-
-            bash -c "echo '
-            network:
-              version: 2
-              renderer: networkd
-              ethernets:
-                eth0:
-                  dhcp4: yes
-                  dhcp6: yes
-                eth1:
-                  addresses:
-                   - ${ETH1_IP_ADDRESS}${ETH1_SUBNET}
-                  dhcp4: no
-                  dhcp6: no
-                  routes:
-                   - to: 0.0.0.0/0
-                     via: 10.0.0.1 # Default gateway
-                     table: 2
-                   - to: ${ETH1_CIDR_BLOCK}
-                     scope: link
-                     table: 2
-                  routing-policy:
-                    - from: ${ETH1_IP_ADDRESS}/32
-                      table: 2
-            ' > /etc/netplan/51-eth1.yaml"
-
-            netplan --debug apply
-
-        else
-            TOKEN=$(curl -X PUT "http://169.254.169.254/latest/api/token" -H "X-aws-ec2-metadata-token-ttl-seconds: 600")
-            BASE_EC2_NETWORK_URL=http://169.254.169.254/latest/meta-data/network/interfaces/macs/
-            NUMBER_OF_ENI=`curl -s -H "X-aws-ec2-metadata-token: ${TOKEN}" ${BASE_EC2_NETWORK_URL} | wc -w`
-            for mac in `curl -s -H "X-aws-ec2-metadata-token: ${TOKEN}" ${BASE_EC2_NETWORK_URL}`
-            do
-                DEVICE_NUMBER=`curl -s -H "X-aws-ec2-metadata-token: ${TOKEN}" ${BASE_EC2_NETWORK_URL}${mac}/device-number`
-                if [[ "$DEVICE_NUMBER" == "1" ]]; then
-                   ETH1_MAC=${mac}
-                fi
-            done
-            if [[ ! "${DEVICE_NUMBER}x" == "x" ]]; then
-               ETH1_IP_ADDRESS=`curl -s -H "X-aws-ec2-metadata-token: ${TOKEN}" ${BASE_EC2_NETWORK_URL}${ETH1_MAC}/local-ipv4s`
-               ETH1_CIDR_BLOCK=`curl -s -H "X-aws-ec2-metadata-token: ${TOKEN}" ${BASE_EC2_NETWORK_URL}${ETH1_MAC}/subnet-ipv4-cidr-block`
-            fi
-            bash -c "echo 'GATEWAYDEV=eth0' >> /etc/sysconfig/network"
-            echo "
-            DEVICE="eth1"
-            BOOTPROTO="dhcp"
-            ONBOOT="yes"
-            TYPE="Ethernet"
-            USERCTL="yes"
-            PEERDNS="yes"
-            IPV6INIT="no"
-            PERSISTENT_DHCLIENT="1"
-            " > /etc/sysconfig/network-scripts/ifcfg-eth1
-            echo "
-            default via 10.0.0.1 dev eth1 table 2
-            ${ETH1_CIDR_BLOCK} dev eth1 src ${ETH1_IP_ADDRESS} table 2
-            " > /etc/sysconfig/network-scripts/route-eth1
-            echo "
-            from ${ETH1_IP_ADDRESS}/32 table 2
-            " > /etc/sysconfig/network-scripts/rule-eth1
-            systemctl restart network
-
-        fi
-    """)
-
-
 def configure_set_preserve_hostname_script():
     return 'grep "preserve_hostname: true" /etc/cloud/cloud.cfg 1>/dev/null 2>&1 ' \
            '|| echo "preserve_hostname: true" >> /etc/cloud/cloud.cfg\n'