1. add random test bucket name 2. add delete test file after finish 3…#173

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coderall wants to merge 4 commits intoaliyun:masterfrom coderall:master

+1,028-10

Commits on Apr 19, 2019

1. add random test bucket name 2. add delete test file after finish 3. add tagging function&tests
coderall
committed

Commits on Apr 22, 2019

1. modify python sdk version 2. add more tests 3. some optimization
coderall
committed

Commits on Apr 24, 2019

add resumable tests & modify lifecycle tagging parse function
coderall
committed

Commits on Apr 25, 2019

add to_query_string method & add test case
coderall
committed