Refactor logging

[jranson]

this Patch removes the go-stack and go-kit/log dependencies in the logging package and refactors all logging calls across the project to work with the new logger.

[coveralls]

Pull Request Test Coverage Report for Build 10412731650

Details

• 294 of 407 (72.24%) changed or added relevant lines in 39 files are covered.
• 18 unchanged lines in 5 files lost coverage.
• Overall coverage decreased (-0.4%) to 89.862%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cache/badger/badger.go	7	8	87.5%
pkg/cache/redis/redis.go	9	10	90.0%
pkg/backends/prometheus/model/vector.go	1	3	33.33%
pkg/cache/bbolt/bbolt.go	9	11	81.82%
pkg/cache/index/index.go	13	15	86.67%
pkg/proxy/engines/httpproxy.go	5	7	71.43%
pkg/proxy/engines/proxy_request.go	0	2	0.0%
pkg/proxy/listener/listener.go	14	16	87.5%
pkg/httpserver/signal/signal.go	1	4	25.0%
pkg/proxy/handlers/purge.go	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/backends/prometheus/model/vector.go	1	92.06%
pkg/proxy/listener/listener.go	1	93.37%
pkg/proxy/engines/httpproxy.go	1	78.08%
pkg/cache/bbolt/bbolt.go	2	88.69%
pkg/observability/logging/logging.go	13	66.67%

Totals
Change from base Build 10407707795:	-0.4%
Covered Lines:	17142
Relevant Lines:	19076

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💛 - Coveralls