Added license information display to output of plugins schema, and tagged all plugins with GPL flag.

include/mysql/plugin.h:
  Adding license information.
plugin/fulltext/plugin_example.c:
  License
sql/ha_ndbcluster.cc:
  License
sql/ha_partition.cc:
  License
sql/handler.h:
  License
sql/log.cc:
  License
sql/sql_show.cc:
  Additional PLUIN display information
storage/archive/ha_archive.cc:
  License information added
storage/blackhole/ha_blackhole.cc:
  License information added
storage/csv/ha_tina.cc:
  License Information
storage/example/ha_example.cc:
  License information
storage/federated/ha_federated.cc:
  License Information
storage/heap/ha_heap.cc:
  License Information
storage/innobase/handler/ha_innodb.cc:
  License Information
storage/myisam/ha_myisam.cc:
  License Information
storage/myisammrg/ha_myisammrg.cc:
  License Information

sql/handler.h

@@ -683,6 +683,7 @@ struct handlerton
                      const char *wild, bool dir, List<char> *files);
    int (*table_exists_in_engine)(handlerton *hton, THD* thd, const char *db,
                                  const char *name);
+   uint32 license; /* Flag for Engine License */
 };