Server improvement

[sk274]

• Make each service run do_work in loop
• Add adjustable polling interval defaulting to 60 seconds
• Separate out ingest queuer and message mover out of ingest manager
• Improve test coverage

[coveralls]

Pull Request Test Coverage Report for Build 59

• 120 of 132 (90.91%) changed or added relevant lines in 7 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+4.0%) to 92.063%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/archival_storage_ingest.rb	38	50	76.0%
<!--	Total:	120	132	90.91%	-->

Totals
Change from base Build 55:	4.0%
Covered Lines:	812
Relevant Lines:	882

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💛 - Coveralls