enhance: add volume lock

[shaloulcy]

Signed-off-by: Eric Li lcy041536@gmail.com

Ⅰ. Describe what this PR did

Right now, the volume core has no lock. It may have problems in some race conditions. In this pull request, we add volume lock.

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how you did it

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #1531 into master will decrease coverage by 1.53%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1531      +/-   ##
==========================================
- Coverage   40.75%   39.22%   -1.54%     
==========================================
  Files         256      254       -2     
  Lines       16756    17488     +732     
==========================================
+ Hits         6829     6859      +30     
- Misses       9048     9752     +704     
+ Partials      879      877       -2

Impacted Files	Coverage Δ
storage/volume/core.go	55.61% <100%> (+3.94%)	⬆️
apis/server/container_bridge.go	60% <0%> (-23.7%)	⬇️
apis/server/router.go	75.14% <0%> (-16.22%)	⬇️
daemon/mgr/container_state.go	67.07% <0%> (-15.02%)	⬇️
daemon/mgr/container.go	34.22% <0%> (-14.84%)	⬇️
cri/v1alpha2/cri.go	0% <0%> (ø)	⬆️
cri/v1alpha1/cri.go	0% <0%> (ø)	⬆️
cli/main.go	0% <0%> (ø)	⬆️
cli/kill.go
client/container_kill.go
... and 3 more

[fuweid]

@shaloulcy Could you mind to provide more information about impact if we have the race condition?

[shaloulcy]

@fuweid Fine. The volume name is unique, no two volumes have the same volume name. Now we create two volumes with the same volume name. If the pouchd has no volume lock, the pouchd will create the volume in the same time, the result is unpredictable.

[fuweid]

LGTM