bugfix: fix that list volumes sets hostname as default label filter

[xiaoxubeii]

Ⅰ. Describe what this PR did

Remove default label filter when list volumes.

Ⅱ. Does this pull request fix one issue?

fixes #2118.

Ⅲ. Why don't you add test cases (unit test/integration test)? (你真的觉得不需要加测试吗？)

Yes.

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[pouchrobot]

@xiaoxubeii Thanks for your contribution. 🍻
Please sign off in each of your commits.

[codecov-io]

Codecov Report

Merging #2119 into master will decrease coverage by 4.38%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2119      +/-   ##
=========================================
- Coverage   64.88%   60.5%   -4.39%     
=========================================
  Files         208     208              
  Lines       16458   16406      -52     
=========================================
- Hits        10679    9926     -753     
- Misses       4451    5293     +842     
+ Partials     1328    1187     -141

Flag	Coverage Δ
#criv1alpha1test	?
#criv1alpha2test	34% <ø> (+0.18%)	⬆️
#integrationtest	39.83% <ø> (+0.27%)	⬆️
#unittest	23.91% <ø> (-0.04%)	⬇️

Impacted Files	Coverage Δ
daemon/mgr/volume.go	83.5% <ø> (+1.15%)	⬆️
cri/v1alpha1/cri_types.go	0% <0%> (-100%)	⬇️
cri/v1alpha1/service/cri.go	0% <0%> (-84.62%)	⬇️
cri/v1alpha1/cri_stream.go	0% <0%> (-80%)	⬇️
cri/v1alpha1/server.go	0% <0%> (-79.85%)	⬇️
cri/v1alpha1/cri.go	0% <0%> (-64.14%)	⬇️
cri/v1alpha1/cri_wrapper.go	0% <0%> (-55.81%)	⬇️
cri/criservice.go	39.7% <0%> (-25%)	⬇️
cri/v1alpha1/cri_utils.go	60.58% <0%> (-23.07%)	⬇️
apis/server/utils.go	61.9% <0%> (-4.77%)	⬇️
... and 10 more

[rudyfly]

LGTM