launch_daemon: actually launch the jobs.

* BRoster::Launch() cannot be used (yet), as it pre-registers the
  application we're launching, and that won't work for the registrar or
  anything else until the registrar is up and running.
* Renamed B_GET_LAUNCH_CONNECTIONS to B_GET_LAUNCH_DATA.
* Add the team ID to the get-launch-data reply.
* Added BLaunchRoster::GetPort() for convenience.
* Removed some superfluous debug output, but temporarily dump all stdio
  to /dev/dprintf (ie. the syslog).
* Made job matching case insensitive (as MIME types should be).

headers/private/app/LaunchDaemonDefs.h

@@ -24,7 +24,7 @@ namespace BPrivate {
 
 // message constants
 enum {
-	B_GET_LAUNCH_CONNECTIONS			= 'lncc',
+	B_GET_LAUNCH_DATA			= 'lncd',
 };
 
 

headers/private/app/LaunchRoster.h

@@ -17,6 +17,8 @@ public:
 			status_t			InitCheck() const;
 
 			status_t			GetData(const char* signature, BMessage& data);
+			port_id				GetPort(const char* signature,
+									const char* name = NULL);
 
 private:
 			void				_InitMessenger();