Add volumes and env vars to helm hook test pod

 - Uses the same extraEnvironmentVars, volumes and volumeMounts set on
   the server statefulset to configure the Vault server test pod used by
   the helm test hook
 - This is necessary in situations where TLS is configured, but the
   certificates are not affiliated with the k8s CA / part of k8s PKI

 - Fixes hashicorpGH-665

templates/tests/server-test.yaml

@@ -1,3 +1,4 @@
+{{ template "vault.mode" . }}
 {{- if .Values.server.enabled }}
 apiVersion: v1
 kind: Pod
@@ -15,6 +16,7 @@ spec:
       env:
         - name: VAULT_ADDR
           value: {{ include "vault.scheme" . }}://{{ template "vault.fullname" . }}.{{ .Release.Namespace }}.svc:{{ .Values.server.service.port }}
+        {{- include "vault.extraEnvironmentVars" .Values.server | nindent 12 }}
       command:
         - /bin/sh
         - -c
@@ -35,6 +37,9 @@ spec:
           fi
 
           exit 0
-
+      volumeMounts:
+        {{ template "vault.mounts" . }}
+  volumes:
+    {{ template "vault.volumes" . }}
   restartPolicy: Never
 {{- end }}