Fast Context Switch: commands

Signed-off-by: Simon Ferquel <simon.ferquel@docker.com>

cli/command/context/testdata/inspect.golden

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+[
+    {
+        "Name": "current",
+        "Metadata": {
+            "Description": "description of current",
+            "StackOrchestrator": "all"
+        },
+        "Endpoints": {
+            "docker": {
+                "Host": "https://someswarmserver",
+                "SkipTLSVerify": false
+            },
+            "kubernetes": {
+                "Host": "https://someserver",
+                "SkipTLSVerify": false,
+                "DefaultNamespace": "default"
+            }
+        },
+        "TLSMaterial": {
+            "kubernetes": [
+                "ca.pem",
+                "cert.pem",
+                "key.pem"
+            ]
+        },
+        "Storage": {
+            "MetadataPath": "<METADATA_PATH>",
+            "TLSPath": "<TLS_PATH>"
+        }
+    }
+]

cli/command/context/testdata/list.golden

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+NAME                DESCRIPTION                               DOCKER ENDPOINT           KUBERNETES ENDPOINT            ORCHESTRATOR
+current *           description of current                    https://someswarmserver   https://someserver (default)   all
+default             Current DOCKER_HOST based configuration                                                            
+other               description of other                      https://someswarmserver   https://someserver (default)   all
+unset               description of unset                      https://someswarmserver   https://someserver (default)   

cli/command/context/testdata/list.no-context.golden

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+NAME                DESCRIPTION                               DOCKER ENDPOINT           KUBERNETES ENDPOINT            ORCHESTRATOR
+default *           Current DOCKER_HOST based configuration   https://someswarmserver   https://someserver (default)   swarm

cli/command/context/testdata/quiet-list.golden

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+current
+other

cli/command/context/testdata/test-kubeconfig

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+apiVersion: v1
+clusters:
+- cluster:
+    certificate-authority-data: dGhlLWNh
+    server: https://someserver
+  name: test-cluster
+contexts:
+- context:
+    cluster: test-cluster
+    user: test-user
+  name: test
+current-context: test
+kind: Config
+preferences: {}
+users:
+- name: test-user
+  user:
+    client-certificate-data: dGhlLWNlcnQ=
+    client-key-data: dGhlLWtleQ==