test: add override default mount config test

[Ace-Tang]

tests user defined bind should override default mount config

Signed-off-by: Ace-Tang aceapril@126.com

Ⅰ. Describe what this PR did

Ⅱ. Does this pull request fix one issue?

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

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@572c732). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #2766   +/-   ##
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  Coverage          ?   69.44%           
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  Files             ?      277           
  Lines             ?    17429           
  Branches          ?        0           
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  Hits              ?    12103           
  Misses            ?     4001           
  Partials          ?     1325

Flag	Coverage Δ
#criv1alpha2_test	39.39% <ø> (?)
#integration_test_0	36.64% <ø> (?)
#integration_test_1	35.45% <ø> (?)
#integration_test_2	36.59% <ø> (?)
#integration_test_3	35.31% <ø> (?)
#node_e2e_test	35.23% <ø> (?)
#unittest	28.52% <ø> (?)

[fuweid]

LGTM