refactor(retrofit): replace com.squareup.okhttp.OkHttpClient with okhttp3.OkHttpClient #683

Job	Run time
Integration-tests (Management)	2m 52s
Provider-Integration-tests (Prometheus, canaryAnalysisIsSuccessful)	4m 26s
build	9m 37s
Integration-tests (Swagger)	2m 42s
Provider-Integration-tests (Prometheus, canaryAnalysisIsFailed)	4m 13s
Provider-Integration-tests (Graphite, canaryAnalysisIsSuccessful)	4m 12s
Provider-Integration-tests (Graphite, canaryAnalysisIsFailed)	4m 12s
	32m 14s

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