Integrate JsonTraceLogFormatter into build system + more.

Where more is:
* Changed the default format to xml, so that all traces don't suddenly
  change as of this commit.  Someone is going to need to start passing a
  flag to all their servers, but let's worry about that later.
* Changed the copyright headers to be the correct filename.
* Include paths should be specified from the root.

flow/JsonTraceLogFormatter.cpp

@@ -1,5 +1,5 @@
 /*
- * XmlTraceLogFormatter.h
+ * JsonTraceLogFormatter.cpp
  *
  * This source file is part of the FoundationDB open source project
  *
@@ -19,7 +19,7 @@
  */
 
 #include "flow/flow.h"
-#include "JsonTraceLogFormatter.h"
+#include "flow/JsonTraceLogFormatter.h"
 
 #include <sstream>
 

flow/JsonTraceLogFormatter.h

@@ -1,5 +1,5 @@
 /*
- * XmlTraceLogFormatter.h
+ * JsonTraceLogFormatter.h
  *
  * This source file is part of the FoundationDB open source project
  *
@@ -18,8 +18,8 @@
  * limitations under the License.
  */
 
-#include "FastRef.h"
-#include "Trace.h"
+#include "flow/FastRef.h"
+#include "flow/Trace.h"
 
 struct JsonTraceLogFormatter : public ITraceLogFormatter, ReferenceCounted<JsonTraceLogFormatter> {
 	const char* getExtension() override;

flow/Knobs.cpp

@@ -123,7 +123,7 @@ FlowKnobs::FlowKnobs(bool randomize, bool isSimulated) {
 	init( TRACE_EVENT_METRIC_UNITS_PER_SAMPLE,                 500 );
 	init( TRACE_EVENT_THROTTLER_SAMPLE_EXPIRY,              1800.0 ); // 30 mins
 	init( TRACE_EVENT_THROTTLER_MSG_LIMIT,                   20000 );
-	init( TRACE_FORMAT,                   			        "json" );
+	init( TRACE_FORMAT,                                      "xml" );
 
 	//TDMetrics
 	init( MAX_METRICS,                                         600 );

flow/flow.vcxproj

@@ -20,8 +20,10 @@
     <ClCompile Include="FaultInjection.cpp" />
     <ClCompile Include="FileTraceLogWriter.cpp" />
     <ClCompile Include="XmlTraceLogFormatter.cpp" />
+    <ClCompile Include="JsonTraceLogFormatter.cpp" />
     <ClInclude Include="FileTraceLogWriter.h" />
     <ClInclude Include="XmlTraceLogFormatter.h" />
+    <ClInclude Include="JsonTraceLogFormatter.h" />
     <ClInclude Include="MetricSample.h" />
     <ClInclude Include="Profiler.h" />
     <ActorCompiler Include="Profiler.actor.cpp" />