Add snap support.

snap/mosquitto.conf

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+port 1883
+persistence true
+user root

snap/snapcraft.yaml

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+name: mosquitto-simple
+version: 1.4.11
+summary: Eclipse Mosquitto MQTT broker
+description: This is a message broker that supports version 3.1 and 3.1.1 of the MQTT
+    protocol.
+    MQTT provides a method of carrying out messaging using a publish/subscribe
+    model. It is lightweight, both in terms of bandwidth usage and ease of
+    implementation. This makes it particularly useful at the edge of the network
+    where a sensor or other simple device may be implemented using an arduino for
+    example.
+confinement: strict
+
+apps:
+  mosquitto:
+    command: usr/local/sbin/mosquitto -c $SNAP/mosquitto.conf
+    daemon: simple
+    restart-condition: always
+    plugs: [network, network-bind]
+
+
+parts:
+  script:
+    plugin: dump
+    source: snap/
+    prime:
+    - mosquitto.conf
+
+
+  mosquitto:
+    plugin: make
+    source: https://github.com/eclipse/mosquitto
+    source-type: git
+
+    build-packages:
+      - libssl-dev
+      - uuid-dev
+    stage-packages:
+      - libssl1.0.0
+      - libuuid1
+    prime:
+    - usr/local/sbin/mosquitto
+    - lib/*-linux-gnu/libcrypto.so*
+    - lib/*-linux-gnu/libssl.so*
+    - lib/*-linux-gnu/libuuid.so*
+