server/minecraft: Allow configuring view distance

roles/server/minecraft/defaults/main.yml

@@ -23,3 +23,4 @@ minecraft_ram: "1G"
 minecraft_start_ram: "{{ minecraft_ram }}"
 minecraft_max_ram: "{{ minecraft_ram }}"
 minecraft_difficulty: "normal"
+minecraft_view_distance: 10

roles/server/minecraft/templates/server.properties

@@ -1,6 +1,6 @@
 #Minecraft server properties
 broadcast-rcon-to-ops=true
-view-distance=10
+view-distance={{ minecraft_view_distance }}
 max-build-height=256
 server-ip=
 level-seed=