[WIP] refactor: add docker/pkg/plugingetter as govendor dependency

[idealhack]

Ⅰ. Describe what this PR did

add docker/pkg/plugingetter as govendor dependency

using the same version as other docker packages (53a58da551e961b3710bbbdfabbc162c3f5f30f6)

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

[pouchrobot]

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

[codecov-io]

Codecov Report

Merging #1436 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1436      +/-   ##
==========================================
- Coverage   38.72%   38.66%   -0.06%     
==========================================
  Files         254      254              
  Lines       16724    16724              
==========================================
- Hits         6477     6467      -10     
- Misses       9421     9429       +8     
- Partials      826      828       +2

Impacted Files	Coverage Δ
ctrd/image.go	76.57% <0%> (-2.86%)	⬇️
daemon/containerio/container_io.go	59.74% <0%> (-1.3%)	⬇️
ctrd/container.go	47.28% <0%> (-0.78%)	⬇️
daemon/mgr/network.go	68.3% <0%> (-0.5%)	⬇️
daemon/mgr/container.go	49.61% <0%> (-0.09%)	⬇️
daemon/logger/jsonfile/utils.go	71.66% <0%> (+1.66%)	⬆️

[idealhack]

Closed in favor of #1445