Fix/presigned url addressing style

[mfshao]

Bug Fixes

• Use auto addressing style for presigned url generation (attempts to use virtual, but falls back to path if necessary)
• Pass endpoint_url from Fence config to boto3 client for presigned url creation

[coveralls]

Pull Request Test Coverage Report for Build 10607427461

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 32 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.02%) to 75.314%

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Files with Coverage Reduction	New Missed Lines	%
resources/ga4gh/passports.py	2	87.43%
blueprints/data/multipart_upload.py	6	25.45%
blueprints/data/indexd.py	24	94.49%
<!--	Total:	32		-->

Totals
Change from base Build 10583956298:	-0.02%
Covered Lines:	7804
Relevant Lines:	10362

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💛 - Coveralls