Upload archive to mlab-testing before integration testing

[stephen-soltesz]

This change adds a curated tar archive for integration tests that depend on this file in archive-mlab-testing. Because some unit tests reset the content of paths in this bucket, the integration-testing.sh script uploads the archive first.

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 6576

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.5%) to 62.833%

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Files with Coverage Reduction	New Missed Lines	%
active/active.go	4	87.64%
<!--	Total:	4		-->

Totals
Change from base Build 6560:	0.5%
Covered Lines:	3513
Relevant Lines:	5591

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💛 - Coveralls