app_server: fix test-app_server for launch_daemon changes

* Make test-app_server work again in a launch_daemon environment

* test_registrar gets a separate signature and port name again so the
  host system can distinguish it from the system registrar

* AppServer is normally a BServer now, however, there can't be two
  BApplications in one team. A class TestServerLoopAdapter is added,
  which becomes the base class of AppServer instead of BServer when
  compiling for libbe_test. It's an adapter class which looks towards
  AppServer as it if was a BServer, but internally it is derived from
  MessageLooper (like the old AppServer before the transition to
  BServer).

  This way, AppServer can stay a BServer in normal builds and it also
  avoids having to use too many #ifdefs to distinguish the two
  versions.

headers/private/app/RegistrarDefs.h

@@ -23,7 +23,14 @@ namespace BPrivate {
 extern const char* kRAppLooperPortName;
 
 
-#define B_REGISTRAR_SIGNATURE "application/x-vnd.haiku-registrar"
+#ifndef HAIKU_TARGET_PLATFORM_LIBBE_TEST
+#	define B_REGISTRAR_SIGNATURE "application/x-vnd.haiku-registrar"
+#	define B_REGISTRAR_PORT_NAME "system:roster"
+#else
+#	define B_REGISTRAR_SIGNATURE "application/x-vnd.test-registrar"
+#	define B_REGISTRAR_PORT_NAME "haiku-test:roster"
+#endif
+
 #define B_REGISTRAR_AUTHENTICATION_PORT_NAME	"auth"
 
 

headers/private/app/ServerProtocol.h

@@ -16,6 +16,10 @@
 #include <SupportDefs.h>
 
 
+#ifdef HAIKU_TARGET_PLATFORM_LIBBE_TEST
+#	define SERVER_PORT_NAME "haiku-test:app_server"
+#endif
+
 #if TEST_MODE
 #	define SERVER_INPUT_PORT "haiku-test:input port"
 #endif