deps: migrate to modules (#386)

Move away from using dep to use Go modules which is production ready as
of 1.14.

Also tidy up README to make instructions for local development clearer

Fixes #385

docker-compose.yml

@@ -7,29 +7,29 @@ services:
             - "80:8080"
         volumes:
             - ./haproxy:/usr/local/etc/haproxy
-            
+
     pwd:
         # pwd daemon container always needs to be named this way
         container_name: pwd
         # use the latest golang image
         image: golang
         # go to the right place and starts the app
-        command: /bin/sh -c 'ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null; cd /go/src/github.com/play-with-docker/play-with-docker; go run api.go -save /pwd/sessions -name l2'
+        command: /bin/sh -c 'ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null; cd /go/src/; go run api.go -save /pwd/sessions -name l2'
         volumes:
             # since this app creates networks and launches containers, we need to talk to docker daemon
             - /var/run/docker.sock:/var/run/docker.sock
             # mount the box mounted shared folder to the container
-            - $GOPATH/src:/go/src
+            - $PWD:/go/src
             - sessions:/pwd
     l2:
         container_name: l2
         # use the latest golang image
         image: golang
         # go to the right place and starts the app
-        command: /bin/sh -c 'ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null; cd /go/src/github.com/play-with-docker/play-with-docker/router/l2; go run l2.go -ssh_key_path /etc/ssh/ssh_host_rsa_key -name l2 -save /pwd/networks'
+        command: /bin/sh -c 'ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null; cd /go/src/router/l2; go run l2.go -ssh_key_path /etc/ssh/ssh_host_rsa_key -name l2 -save /pwd/networks'
         volumes:
-            - $GOPATH/src:/go/src
             - /var/run/docker.sock:/var/run/docker.sock
+            - $PWD:/go/src
             - networks:/pwd
         ports:
             - "8022:22"