Revert "remove hack in version"

This reverts commit b2b9334f27e1a773b77241efa214af2e87439d3b.

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@crosbymichael.com> (github: crosbymichael)

server/server.go

@@ -846,7 +846,7 @@ func (srv *Server) DockerInfo(job *engine.Job) engine.Status {
 func (srv *Server) DockerVersion(job *engine.Job) engine.Status {
 	v := &engine.Env{}
 	v.Set("Version", dockerversion.VERSION)
-	v.Set("ApiVersion", string(api.APIVERSION))
+	v.SetJson("ApiVersion", api.APIVERSION)
 	v.Set("GitCommit", dockerversion.GITCOMMIT)
 	v.Set("GoVersion", goruntime.Version())
 	v.Set("Os", goruntime.GOOS)