Adding a test building a file analyzer plugin.

Also cleaning up, and moving, the other plugin tests.

testing/btest/plugins/file-plugin/src/Foo.h

@@ -0,0 +1,23 @@
+
+#ifndef BRO_PLUGIN_DEMO_FOO_H
+#define BRO_PLUGIN_DEMO_FOO_H
+
+#include <Val.h>
+#include <file_analysis/Analyzer.h>
+
+namespace plugin {
+namespace Demo_Foo {
+
+class Foo : public file_analysis::Analyzer {
+public:
+	virtual bool DeliverStream(const u_char* data, uint64 len);
+
+	static file_analysis::Analyzer* Instantiate(RecordVal* args, file_analysis::File* file);
+
+protected:
+	Foo(RecordVal* args, file_analysis::File* file);
+};
+
+} }
+
+#endif