Don't fail Kubespray scenario if swap is enabled

We have swap enabled in CI, by default Kubespray refuses to run with
swap, and so does Kubelet. Make this behavior configurable and allow
swap in the Kubespray scenario env file. It should be fine to run with
swap for development/testing [1].

[1] https://github.com/kubernetes-incubator/kubespray/issues/1787#issuecomment-336159788

Depends-On: I7a02134970c1b1754d42c4e85ed0a2188a5ecdb6
Change-Id: I023824a31f1278b01c33ce81d4af81247dd5f672

ci/environments/scenario006-multinode.yaml

@@ -31,6 +31,10 @@ resource_registry:
 
 
 parameter_defaults:
+  # NOTE: CI envs have swap, which by default blocks Kubespray and Kubelet.
+  # https://github.com/kubernetes-incubator/kubespray/issues/1787#issuecomment-336155007
+  KubesprayIgnoreAssertErrors: true
+
   ControllerServices:
     - OS::TripleO::Services::Docker
     - OS::TripleO::Services::Kernel

extraconfig/services/kubernetes-master.yaml

@@ -32,6 +32,11 @@ parameters:
     description: Mapping of service endpoint -> protocol. Typically set
                  via parameter_defaults in the resource registry.
     type: json
+  KubesprayIgnoreAssertErrors:
+    default: false
+    description: Ignore kubespray pre-flight checks. Useful for deploying
+                 on environments with swap enabled.
+    type: boolean
 
 outputs:
   role_data:
@@ -131,9 +136,19 @@ outputs:
             - name: generate kubespray global vars
               copy:
                 dest: "{{playbook_dir}}/kubespray/global_vars.yml"
-                content: |
-                  kubeconfig_localhost: true
-                  artifacts_dir: '{{playbook_dir}}/kubespray/artifacts'
+                content:
+                  str_replace:
+                    template: |
+                      kubeconfig_localhost: true
+                      artifacts_dir: '{{playbook_dir}}/kubespray/artifacts'
+                      ignore_assert_errors: IGNORE_ASSERT_ERRORS
+                      kubelet_fail_swap_on: KUBELET_FAIL_SWAP_ON
+                    params:
+                      IGNORE_ASSERT_ERRORS: {get_param: KubesprayIgnoreAssertErrors}
+                      KUBELET_FAIL_SWAP_ON:
+                        yaql:
+                          expression: not $.data
+                          data: {get_param: KubesprayIgnoreAssertErrors}
             - name: generate kubespray playbook
               copy:
                 dest: "{{playbook_dir}}/kubespray/playbook.yml"