Add beesd@.service to gitignore

It's a generated file. We should ignore it, so it won't be accidently be
checked in.

Signed-off-by: Kai Krakow <kai@kaishome.de>

.gitignore

@@ -12,3 +12,4 @@ make.log
 make.log.new
 localconf
 scripts/beesd
+scripts/beesd@.service