Implement initial MailHog Support.

templates/mailhog/0/docker-compose.yml

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+version: '2'
+services:
+  mailhog:
+    image: mailhog/mailhog
+    environment:
+      MH_UI_WEB_PATH: ${mh_ui_web_path}
+      MH_SMTP_BIND_ADDR: ${mh_smtp_bind_addr}
+    stdin_open: true
+    tty: true
+    user: root
+    labels:
+      io.rancher.container.pull_image: always

templates/mailhog/0/rancher-compose.yml

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+.catalog:
+  name: MailHog
+  version: 0.0.1
+  description: MailHog E-mail Capture Tools
+  questions:
+    - variable: mh_ui_web_path
+      label: Web UI Path
+      type: string
+      required: true
+      default: ''
+      description: Defines the URL path for viewing MailHog.
+    - variable: mh_smtp_bind_addr
+      label: SMTP Bind Address
+      type: string
+      required: true
+      default: 0.0.0.0:25
+      description: Defines the IP/Port combination for the SMTP listener.

templates/mailhog/config.yml

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+name: MailHog
+description: MailHog E-mail Capture Tools
+version: 0.0.1
+category: Services