[release/1.1] cherry-pick: optimize shim lock in runtime v1

[Random-Liu]

We also need this fix in release 1.1.

I think this is the last piece for #2709.

Note that the lock location for Create is not updated in this cherry-pick, because:

1. It is not necessary. Create should be called as the first function, and no other functions will be called at the same time.
2. It is matches the behavior of shim v2 https://github.com/containerd/containerd/blob/master/runtime/v2/runc/service.go#L226.
3. In release/1.1, all logic is in proc.New. There is no way for us to add the lock at the same place with bugfix: optimize shim lock in runtime v1 avoid dead lock #2743.

/cc @Ace-Tang

[codecov-io]

Codecov Report

Merging #2765 into release/1.1 will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release/1.1    #2765   +/-   ##
============================================
  Coverage        48.99%   48.99%           
============================================
  Files               85       85           
  Lines             7603     7603           
============================================
  Hits              3725     3725           
  Misses            3203     3203           
  Partials           675      675

Flag	Coverage Δ
#linux	48.99% <ø> (ø)	⬆️

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[crosbymichael]

LGTM

[estesp]

LGTM