Add global bin tests along with testdata

cmd/dkl-dir2config/testdata/cert-requests.yaml

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+- name: etcd-server
+  ca: etcd
+  profile: server
+  per_host: true
+  template: |
+    {"CN":"{{.host.name}}","hosts":["127.0.0.1","{{.host.ip}}"],"key":{"algo":"ecdsa","size":256}}
+- name: etcd-peer
+  ca: etcd
+  profile: peer
+  per_host: true
+  template: |
+    {"CN":"{{.host.name}}","hosts":["127.0.0.1","{{.host.ip}}"],"key":{"algo":"ecdsa","size":256}}
+- name: etcd-client
+  ca: etcd
+  profile: client
+  template: |
+    {"CN":"client","hosts":["*"],"key":{"algo":"ecdsa","size":256}}
+
+- name: apiserver
+  ca: cluster
+  profile: server
+  per_host: true
+  template: |
+    {"CN":"{{.host.name}}","hosts":[
+        "kubernetes", "kubernetes.default", "kubernetes.default.svc.{{.cluster.domain}}","{{.host.name}}",
+        "127.0.0.1","{{.cluster.kubernetes_svc_ip}}","{{.vars.public_vip}}",
+        {{- if .vars.apiserver_vip }}"{{.vars.apiserver_vip}}",{{ end }}
+        "{{.host.ip}}"
+    ],"key":{"algo":"ecdsa","size":521}}
+- name: cluster-client
+  ca: cluster
+  profile: client
+  template: |
+    {"CN":"client","hosts":["*"],"key":{"algo":"ecdsa","size":256}}
+- name: kubelet-client
+  ca: cluster
+  profile: client
+  template: |
+    {"CN":"kubelet-client","names":[{"O":"system:masters"}],"hosts":["*"],"key":{"algo":"ecdsa","size":256}}

cmd/dkl-dir2config/testdata/clusters/test.yaml

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+from: v1.19:test

cmd/dkl-dir2config/testdata/groups/test-master.yaml

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+from: v1.19:master

cmd/dkl-dir2config/testdata/hosts/test1.yaml

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+ip: 172.16.0.1
+cluster: test
+group: test-master

cmd/dkl-dir2config/testdata/hosts/test2.yaml

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+ip: 172.16.0.2
+cluster: test
+group: test-master

cmd/dkl-dir2config/testdata/hosts/test3.yaml

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+ip: 172.16.0.3
+cluster: test
+group: test-master

cmd/dkl-dir2config/testdata/ssl-config.json

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+{
+    "signing": {
+        "default": {
+            "expiry": "43800h"
+        },
+        "profiles": {
+            "server": {
+                "expiry": "43800h",
+                "usages": [
+                    "signing",
+                    "key encipherment",
+                    "server auth"
+                ]
+            },
+            "client": {
+                "expiry": "43800h",
+                "usages": [
+                    "signing",
+                    "key encipherment",
+                    "client auth"
+                ]
+            },
+            "peer": {
+                "expiry": "43800h",
+                "usages": [
+                    "signing",
+                    "key encipherment",
+                    "server auth",
+                    "client auth"
+                ]
+            }
+        }
+    }
+}