Revert "automation: Explicitly enable IPv6 on test container"

This reverts commit 5f3e724190d12ddc20c5681ea4159069a302141b.

Signed-off-by: Edward Haas <edwardh@redhat.com>

automation/run-integration-tests.sh

@@ -36,9 +36,7 @@ function add_extra_networks {
     docker network connect $NET1 $CONTAINER_ID
     docker_exec '
       ip addr flush eth1 && \
-      ip addr flush eth2 && \
-      echo 0 > /proc/sys/net/ipv6/conf/eth1/disable_ipv6 || true \
-      echo 0 > /proc/sys/net/ipv6/conf/eth2/disable_ipv6 || true
+      ip addr flush eth2
     '
 }