fix missing XML tags

Author: littleaj

agent/agent-bootstrap/src/main/resources/rp-logger-config/diagnostics.appender.xml

@@ -1,3 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<included>
+    <property scope="local" name="ai.appsvc.logfile.name" value="application-insights-extension" />
+    <property scope="local" name="ai.appsvc.logfile.ext" value=".log" />
+    <property scope="local" name="ai.appsvc.logfile.old.ext" value="${ai.appsvc.logfile.ext}.old" />
 
     <!-- internal troubleshooting/diagnostics logs -->
     <appender name="DIAGNOSTICS_FILE" class="com.microsoft.applicationinsights.agent.shadow.ch.qos.logback.core.rolling.RollingFileAppender">