Temporarily skip failing Docker tests on RHEL 7.6.

test/integration/targets/docker_config/aliases

@@ -5,3 +5,4 @@ destructive
 skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # we skip all docker-based CI runs to avoid disrupting
              # the whole CI system.
+skip/rhel7.6

test/integration/targets/docker_container/aliases

@@ -2,3 +2,4 @@ shippable/posix/group4
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_container_info/aliases

@@ -2,3 +2,4 @@ shippable/posix/group2
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_host_info/aliases

@@ -2,3 +2,4 @@ shippable/posix/group2
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_image/aliases

@@ -2,3 +2,4 @@ shippable/posix/group3
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_image_info/aliases

@@ -2,3 +2,4 @@ shippable/posix/group2
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_network/aliases

@@ -2,3 +2,4 @@ shippable/posix/group4
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_network_info/aliases

@@ -2,3 +2,4 @@ shippable/posix/group2
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_node/aliases

@@ -8,3 +8,4 @@ skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # after finishing the tests to minimize potential effects
              # on other tests.
 needs/root
+skip/rhel7.6

test/integration/targets/docker_node_info/aliases

@@ -5,3 +5,4 @@ destructive
 skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # we skip all docker-based CI runs to avoid disrupting
              # the whole CI system.
+skip/rhel7.6

test/integration/targets/docker_prune/aliases

@@ -2,3 +2,4 @@ shippable/posix/group2
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_secret/aliases

@@ -5,3 +5,4 @@ destructive
 skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # we skip all docker-based CI runs to avoid disrupting
              # the whole CI system.
+skip/rhel7.6

test/integration/targets/docker_stack/aliases

@@ -5,3 +5,4 @@ destructive
 skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # we skip all docker-based CI runs to avoid disrupting
              # the whole CI system.
+skip/rhel7.6

test/integration/targets/docker_swarm/aliases

@@ -8,3 +8,4 @@ skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # after finishing the tests to minimize potential effects
              # on other tests.
 needs/root
+skip/rhel7.6

test/integration/targets/docker_swarm_info/aliases

@@ -5,3 +5,4 @@ destructive
 skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # we skip all docker-based CI runs to avoid disrupting
              # the whole CI system.
+skip/rhel7.6

test/integration/targets/docker_swarm_service/aliases

@@ -5,3 +5,4 @@ destructive
 skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # we skip all docker-based CI runs to avoid disrupting
              # the whole CI system.
+skip/rhel7.6

test/integration/targets/docker_volume/aliases

@@ -2,3 +2,4 @@ shippable/posix/group2
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/docker_volume_info/aliases

@@ -2,3 +2,4 @@ shippable/posix/group1
 skip/osx
 skip/freebsd
 destructive
+skip/rhel7.6

test/integration/targets/inventory_docker_swarm/aliases

@@ -8,3 +8,4 @@ skip/docker  # The tests sometimes make docker daemon unstable; hence,
              # after finishing the tests to minimize potential effects
              # on other tests.
 needs/root
+skip/rhel7.6