test: refactor index remote

[bwanglzu]

1. Removed index remote 2 from tests, since it testing the delete args --allow-spawn (removed in refactor(proto): remove spawn request #1276 ).
2. Refactor index remote test.
3. Remove JinaTestCase from __init__, we're not using unittest anymore.

[codecov]

Codecov Report

Merging #1346 (44e085f) into master (f8db230) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1346      +/-   ##
==========================================
- Coverage   83.27%   83.19%   -0.08%     
==========================================
  Files         103      103              
  Lines        6744     6744              
==========================================
- Hits         5616     5611       -5     
- Misses       1128     1133       +5     

Impacted Files	Coverage Δ
jina/peapods/grpc_asyncio.py	75.51% <0.00%> (-5.11%)	⬇️
jina/peapods/container.py	88.40% <0.00%> (-2.90%)	⬇️
jina/drivers/querylang/select.py	86.20% <0.00%> (+6.89%)	⬆️

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[bhavsarpratik]

No comments from my side as I am not familiar with remote functionality

[JoanFM]

This should be using tmpdir?

[hanxiao]

No comments from my side as I am not familiar with remote functionality

@bhavsarpratik always keeps in mind jina is not for local environment, it is decentralized from day one. So remote feature is something MUST know especially for core develoeprs.

[bhavsarpratik]

@hanxiao True, I will spend time understanding the current features.

[bhavsarpratik]

@bwanglzu You can convert all path to pathlib path

[bwanglzu]

@bhavsarpratik nice proposal, I like it as well, shall we do it in a separate pr (for all the tests.)?