Add support for cgroupns_mode (#3700)

Author: zhan9san

src/molecule/data/molecule.json

@@ -140,8 +140,9 @@
           "title": "Box",
           "type": "string"
         },
-        "cgroupns": {
-          "title": "Cgroupns",
+        "cgroupns_mode": {
+          "enum": ["host", "private"],
+          "title": "Cgroup namespace mode",
           "type": "string"
         },
         "children": {

tools/test-schema/test/molecule/cluster/molecule.yml

@@ -18,6 +18,7 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
+    cgroupns_mode: private
     pre_build_image: true
     groups:
       - zookeeper
@@ -30,6 +31,7 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
+    cgroupns_mode: private
     pre_build_image: true
     groups:
       - zookeeper
@@ -42,6 +44,7 @@ platforms:
     volumes:
       - /sys/fs/cgroup:/sys/fs/cgroup:ro
     privileged: true
+    cgroupns_mode: private
     pre_build_image: true
     groups:
       - zookeeper