Allow connectionString to be overridden multiple times without restarting the AppInsights Agent about applicationinsights-java

[slavik112211]

Fantastic, thanks @jeanbisutti.

Will provide feedback early next week.

[jeanbisutti]

@slavik112211 You can download here a SNAPSHOT version with the connection string check removed. Could you please try it?

[slavik112211]

@jeanbisutti,

confirming that the provided applicationinsights-agent-3.5-SNAPSHOT.jar correctly sets the connectionString multiple times throught the lifecycle of the application using:
com.microsoft.applicationinsights.connectionstring.ConnectionString.configure(connectionString);
Tested using telemetryClient.trackMetric(metric), and confirm that customMetrics end up in different AppInsights endpoints.

Please proceed with merging your change into Production version.

Please note, our app is not using the agent jar directly (i.e. applicationinsights-agent-3.5-SNAPSHOT.jar), but rather uses <artifactId>applicationinsights-runtime-attach</artifactId>, and thus the new agent would need to be incorporated into the new applicationinsights-runtime-attach Maven package.

[jeanbisutti]

@slavik112211 Thanks for testing. The fix will work both with -javaagent and with the applicationinsights-runtime-attach dependency.