RDISCROWD-6259: BCOS v2 support under fileproxy

[dchhabda]

• add boto3 support
• profiling fileproxy code
• add ability to import csv under bcos v2 buckets via /fileproxy
• add ability for task presenter to load contents from file under bcos v2

[coveralls]

Pull Request Test Coverage Report for Build 6643652966

• 132 of 184 (71.74%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.2%) to 93.914%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pybossa/cloud_store_api/connection.py	36	38	94.74%
pybossa/cloud_store_api/base_conn.py	85	135	62.96%

Totals
Change from base Build 6510840306:	-0.2%
Covered Lines:	17099
Relevant Lines:	18207

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💛 - Coveralls

[ciaracian]

Deep explained that in this PR he is adding support for boto3 so that he can test it before making further changes. He is also adding profiling to support additional transparency as he goes.

[dchhabda]

Deep explained that in this PR he is adding support for boto3 so that he can test it before making further changes. He is also adding profiling to support additional transparency as he goes.

@ciaracian , the PR has been modified for importing task supporting v2; updated description with details. I'm working on adding more tests. However, code can be reviewed. Please review when you get chance. Thanks!

[ciaracian]

Looks good so far, to the best of my knowledge. Thanks Deep!

[ciaracian]

Looks good to me - thanks Deep!