set master ip in docker compose yaml file

fix https://github.com/chrislusf/seaweedfs/issues/1118

docker/dev-compose.yml

@@ -8,7 +8,7 @@ services:
     ports:
     - 9333:9333
     - 19333:19333
-    command: "master"
+    command: "master -ip=master"
   volume:
     build:
       context: .

docker/entrypoint.sh

@@ -3,7 +3,7 @@
 case "$1" in
 
   'master')
-  	ARGS="-ip `hostname -i` -mdir /data"
+  	ARGS="-mdir /data"
 	# Is this instance linked with an other master? (Docker commandline "--link master1:master")
 	if [ -n "$MASTER_PORT_9333_TCP_ADDR" ] ; then
 		ARGS="$ARGS -peers=$MASTER_PORT_9333_TCP_ADDR:$MASTER_PORT_9333_TCP_PORT"

docker/seaweedfs-compose.yml

@@ -6,7 +6,7 @@ services:
     ports:
     - 9333:9333
     - 19333:19333
-    command: "master"
+    command: "master -ip=master"
   volume:
     image: chrislusf/seaweedfs # use a remote image
     ports: