Release CentOS7 dockerfile [skip pd_pr]

[SabaPing]

• centos7 build image

(cherry picked from commit 320b30c)

• cleanup dockerfiles

(cherry picked from commit 98f0964)

• fix centos7 build; fix test

• fix test

(cherry picked from commit e480781)

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has not been approved.

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (release@77b5783). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             release    #1468   +/-   ##
==========================================
  Coverage           ?   26.17%           
==========================================
  Files              ?      202           
  Lines              ?    15405           
  Branches           ?      103           
==========================================
  Hits               ?     4033           
  Misses             ?    11101           
  Partials           ?      271           

Flag	Coverage Δ
backend_integration	8.97% <0.00%> (?)
backend_ut	27.58% <0.00%> (?)
e2e_test	62.13% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 77b5783...f9aec37. Read the comment docs.