fix panic in shim is not logged

[milkwine]

#4274

The daemon log will be:

...
DEBU[2020-06-03T14:48:54.204864142+08:00] event forwarded                               ns=default topic=/tasks/create type=containerd.events.TaskCreate
DEBU[2020-06-03T14:48:54.225318724+08:00] event forwarded                               ns=default topic=/tasks/start type=containerd.events.TaskStart
panic: test20200520

goroutine 7 [running]:
github.com/containerd/containerd/runtime/v2/shim.Run.func1()
	/home/zsy/.asdf/installs/golang/1.13.5/packages/src/github.com/containerd/containerd/runtime/v2/shim/shim.go:151 +0x47
created by github.com/containerd/containerd/runtime/v2/shim.Run
	/home/zsy/.asdf/installs/golang/1.13.5/packages/src/github.com/containerd/containerd/runtime/v2/shim/shim.go:149 +0x47
INFO[2020-06-03T14:48:56.998794944+08:00] shim disconnected                             id=foo
WARN[2020-06-03T14:48:56.998935894+08:00] cleaning up after shim disconnected           id=foo namespace=default
INFO[2020-06-03T14:48:56.998989197+08:00] cleaning up dead shim                        
...

This pr has changed project containerd/fifo in vendor directory, because dup2 need to pass fd as param which hold by struct fifo.

[theopenlab-ci]

Build succeeded.

• containerd-build-arm64 : FAILURE in 2m 09s (non-voting)

[milkwine]

Need to open a PR in containerd/fifo first if we want this.

[AkihiroSuda]

Could you open fifo PR?

[AkihiroSuda]

cc @tonistiigi

[jterry75]

@kevpar - Since it looks like this is going to be a fifo approach for windows, we will likely need the shim on Windows to re-log the panic.log file in the task's dir. This will need a follow up pr from the Windows side

[AkihiroSuda]

ping @milkwine

[AkihiroSuda]

@milkwine Are you still interested in this?

[AkihiroSuda]

Carried as #4657