Fix ITelemetryModule singleton registration to support presence of keyed services #91

Job	Run time
Analyze (csharp) (./NETCORE/ApplicationInsights.AspNetCore.sln)	12m 15s
Analyze (csharp) (./Everything.sln)	24m 40s
Analyze (csharp) (./ProjectsForSigning.sln)	7m 24s
Analyze (csharp) (./examples/Examples.sln)	7m 20s
Analyze (csharp) (./LOGGING/Logging.sln)	9m 14s
Analyze (csharp) (./BASE/Microsoft.ApplicationInsights.sln)	11m 19s
Analyze (csharp) (./WEB/Src/Microsoft.ApplicationInsights.Web.sln)	12m 0s
	1h 24m 12s

Provide feedback