Delete temporary .etl files in stop_tracing.bat

The lab tracing batch files weren't cleaning up the temporary .etl files
after merging them. This fixes that. This change also renames the files
and the user session to avoid possible name conflicts.

LabScripts/GeneralTracing/set_vars.bat

@@ -30,9 +30,9 @@ rem %temp% should be a good location for temporary traces.
 rem Make sure this is a fast drive, preferably an SSD.
 set xperftemptracedir=%temp%
 rem Select locations for the temporary kernel and user trace files.
-set kernelfile=%xperftemptracedir%\kernel.etl
-set userfile=%xperftemptracedir%\user.etl
-set SessionName=usersession
+set kernelfile=%xperftemptracedir%\lab_etw_kernel.etl
+set userfile=%xperftemptracedir%\lab_etw_user.etl
+set SessionName=lab_etw_usersession
 
 rem PROC_THREAD+LOADER are required in order to know what binaries are loaded
 rem and what threads are running.

LabScripts/GeneralTracing/stop_tracing.bat

@@ -46,6 +46,7 @@ set FileName=%OutputDir%trace.etl
 set FileAndCompressFlags="%FileName%" -compress
 
 xperf -merge "%kernelfile%" "%userfile%" %FileAndCompressFlags%
+del "%kernelfile%" "%userfile%"
 
 rem Generate an exporter config file based on marks in the trace and all the
 rem .wpaProfile files found.