fix: make swagger version locked 0.12.0 rather than lastet

[allencloud]

Signed-off-by: Allen Sun [email protected]

Ⅰ. Describe what this PR did

In the original Dockerfile, we use command go get -u github.com/go-swagger/go-swagger/cmd/swagger to install swagger binary which is already from the newest code. And we cannot guarantee the quality of the latest code ever.

As we had a rule in hack/generate-swagger-models.sh that we should use swagger 0.12.0 to meet our requirement, we should always download a binary which is locked to version swagger 0.12.0.

As a result, I change the command to be wget --quiet -O /bin/swagger https://github.com/go-swagger/go-swagger/releases/download/0.12.0/swagger_linux_amd64.

Ⅱ. Does this pull request fix one issue?

This issue happens almost in all pull requests which we have modified the swagger.yml.
Like #879, #878, #875 and so on

Ⅲ. Describe how you did it

change a command to finish this

Ⅳ. Describe how to verify it

none

Ⅴ. Special notes for reviews

[codecov-io]

Codecov Report

Merging #881 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #881   +/-   ##
=======================================
  Coverage   14.62%   14.62%           
=======================================
  Files         115      115           
  Lines        6940     6940           
=======================================
  Hits         1015     1015           
  Misses       5839     5839           
  Partials       86       86

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[allencloud]

LGTM