Make ping not use docker/docker and update Dockerfiles

Dockerfile

@@ -4,8 +4,6 @@ COPY . /go/src/github.com/play-with-docker/play-with-docker
 
 WORKDIR /go/src/github.com/play-with-docker/play-with-docker
 
-RUN go get -v -d ./...
-
 RUN ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null
 
 RUN CGO_ENABLED=0 go build -a -installsuffix nocgo -o /go/bin/play-with-docker .

Dockerfile.l2

@@ -1,11 +1,10 @@
-FROM golang:1.8
+FROM golang:1.9
 
 # Copy the runtime dockerfile into the context as Dockerfile
 COPY . /go/src/github.com/play-with-docker/play-with-docker
 
 WORKDIR /go/src/github.com/play-with-docker/play-with-docker
 
-RUN go get -v -d ./...
 
 RUN ssh-keygen -N "" -t rsa -f /etc/ssh/ssh_host_rsa_key >/dev/null
 

Gopkg.lock

@@ -84,18 +84,6 @@
   packages = ["query"]
   revision = "53e6ce116135b80d037921a7fdd5138cf32d7a8a"
 
-[[projects]]
-  branch = "master"
-  name = "github.com/googollee/go-engine.io"
-  packages = [".","message","parser","polling","transport","websocket"]
-  revision = "80ae0e43aca17b4c5a6834999d0f2eaa16b9afda"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/googollee/go-socket.io"
-  packages = ["."]
-  revision = "5447e71f36d394766bf855d5714a487596809f0d"
-
 [[projects]]
   name = "github.com/gorilla/context"
   packages = ["."]
@@ -290,6 +278,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "235d01ea73c9f692dddf5fcf203a99dcd2ad75c6ef0fc3d51a60bf949d4fbdc9"
+  inputs-digest = "b4e3f9681dc0f331b539efe648984eff43aaf82270bee1adfad1a7aa07732ffa"
   solver-name = "gps-cdcl"
   solver-version = 1

handlers/ping.go

@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/docker/docker/client"
+	docker "docker.io/go-docker"
 	"github.com/play-with-docker/play-with-docker/config"
 	"github.com/shirou/gopsutil/load"
 )
@@ -14,7 +14,7 @@ import (
 func Ping(rw http.ResponseWriter, req *http.Request) {
 	// Get system load average of the last 5 minutes and compare it against a threashold.
 
-	c, err := client.NewEnvClient()
+	c, err := docker.NewEnvClient()
 
 	if err != nil {
 		rw.WriteHeader(http.StatusInternalServerError)