[Airflow]Fix remote log handler bug

[aqua7regia]

What is the purpose of the change

Fix #172

Brief change log

• Change the log_relative_path in remote log handler like S3, GCS, Azure when they init the context.
• Add get_provider_info.py to pass airflow test cases.
• Modified old test case in providers.

Verifying this change

This change has modified old test case to fit these new remote log handlers.

[SteNicholas]

LGTM.

[SteNicholas]

@aqua7regia , thanks for your contribution. I have checked all the log handlers and you missed the CloudwatchTaskHandler and ElasticsearchTaskHandler. Please add these handlers into this pull request.

[codecov-commenter]

Codecov Report

Merging #174 (c6be2a5) into master (723afa8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #174   +/-   ##
=======================================
  Coverage   59.37%   59.37%           
=======================================
  Files         169      169           
  Lines       13027    13027           
  Branches     1684     1684           
=======================================
  Hits         7735     7735           
  Misses       4868     4868           
  Partials      424      424           

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