Data race in containerData.GetInfo()

[bboreham]

I guess it should lock the mutex.

I0929 15:14:27.616155   84079 cadvisor.go:179] Starting cAdvisor version: v0.53.0.4+5adb1c3bb38b4c-5adb1c3b on port 8080
==================
WARNING: DATA RACE
Read at 0x00c0004d3a50 by goroutine 221:
  github.com/google/cadvisor/manager.(*containerData).GetInfo()
      /home/ec2-user/src/github.com/google/cadvisor/manager/container.go:175 +0x7b
  github.com/google/cadvisor/manager.(*manager).containerDataToContainerInfo()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:545 +0x56
  github.com/google/cadvisor/manager.(*manager).containerDataSliceToContainerInfoSlice()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:674 +0x137
  github.com/google/cadvisor/manager.(*manager).SubcontainersInfo()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:601 +0x266
  github.com/google/cadvisor/cmd/internal/api.(*version1_1).HandleRequest()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/internal/api/versions.go:162 +0x256
  github.com/google/cadvisor/cmd/internal/api.handleRequest()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/internal/api/handler.go:121 +0x4eb
  github.com/google/cadvisor/cmd/internal/api.RegisterHandlers.func1()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/internal/api/handler.go:51 +0x68
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/go/src/net/http/server.go:2322 +0x47
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/go/src/net/http/server.go:2861 +0x242
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/go/src/net/http/server.go:2861 +0x242
  net/http.serverHandler.ServeHTTP()
      /usr/local/go/src/net/http/server.go:3340 +0x2a1
  net/http.(*conn).serve()
      /usr/local/go/src/net/http/server.go:2109 +0xda4
  net/http.(*Server).Serve.gowrap3()
      /usr/local/go/src/net/http/server.go:3493 +0x4f

Previous write at 0x00c0004d3a50 by goroutine 222:
  github.com/google/cadvisor/manager.(*containerData).GetInfo()
      /home/ec2-user/src/github.com/google/cadvisor/manager/container.go:186 +0x195
  github.com/google/cadvisor/manager.(*manager).containerDataToContainerInfo()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:545 +0x56
  github.com/google/cadvisor/manager.(*manager).GetContainerInfo()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:506 +0x7c
  github.com/google/cadvisor/cmd/internal/api.(*version1_0).HandleRequest()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/internal/api/versions.go:112 +0x35e
  github.com/google/cadvisor/cmd/internal/api.handleRequest()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/internal/api/handler.go:121 +0x4eb
  github.com/google/cadvisor/cmd/internal/api.RegisterHandlers.func1()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/internal/api/handler.go:51 +0x68
  net/http.HandlerFunc.ServeHTTP()
      /usr/local/go/src/net/http/server.go:2322 +0x47
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/go/src/net/http/server.go:2861 +0x242
  net/http.(*ServeMux).ServeHTTP()
      /usr/local/go/src/net/http/server.go:2861 +0x242
  net/http.serverHandler.ServeHTTP()
      /usr/local/go/src/net/http/server.go:3340 +0x2a1
  net/http.(*conn).serve()
      /usr/local/go/src/net/http/server.go:2109 +0xda4
  net/http.(*Server).Serve.gowrap3()
      /usr/local/go/src/net/http/server.go:3493 +0x4f

Goroutine 221 (running) created at:
  net/http.(*Server).Serve()
      /usr/local/go/src/net/http/server.go:3493 +0x889
  net/http.(*Server).ListenAndServe()
      /usr/local/go/src/net/http/server.go:3389 +0xb3
  net/http.ListenAndServe()
      /usr/local/go/src/net/http/server.go:3704 +0x188c
  main.main()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/cadvisor.go:185 +0x189d
  github.com/google/cadvisor/container.InitializePlugins()
      /home/ec2-user/src/github.com/google/cadvisor/container/factory.go:219 +0x29a
  github.com/google/cadvisor/manager.(*manager).Start()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:290 +0xb9
  main.main()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/cadvisor.go:172 +0x1048

Goroutine 222 (running) created at:
  net/http.(*Server).Serve()
      /usr/local/go/src/net/http/server.go:3493 +0x889
  net/http.(*Server).ListenAndServe()
      /usr/local/go/src/net/http/server.go:3389 +0xb3
  net/http.ListenAndServe()
      /usr/local/go/src/net/http/server.go:3704 +0x188c
  main.main()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/cadvisor.go:185 +0x189d
  github.com/google/cadvisor/container.InitializePlugins()
      /home/ec2-user/src/github.com/google/cadvisor/container/factory.go:219 +0x29a
  github.com/google/cadvisor/manager.(*manager).Start()
      /home/ec2-user/src/github.com/google/cadvisor/manager/manager.go:290 +0xb9
  main.main()
      /home/ec2-user/src/github.com/google/cadvisor/cmd/cadvisor.go:172 +0x1048
==================