refactor(retrofit): Replace the RetrofitExceptionHandler with SpinnakerServerExceptionHandler #632

Job	Run time
build	8m 47s
Integration-tests (Management)	2m 55s
Provider-Integration-tests (Prometheus, canaryAnalysisIsSuccessful)	4m 27s
Integration-tests (Swagger)	3m 23s
Provider-Integration-tests (Prometheus, canaryAnalysisIsFailed)	4m 8s
Provider-Integration-tests (Graphite, canaryAnalysisIsSuccessful)	4m 21s
Provider-Integration-tests (Graphite, canaryAnalysisIsFailed)	4m 22s
	32m 23s

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