BUG#30271 NDB_LE_MemoryUsage.page_size_kb actually returns page size in bytes, not kilobyte

ndb/include/mgmapi/ndb_logevent.h:
  Add page_size_bytes member variable for MemoryUsage. And don't remove page_size_kb member variable at present for the compatibility backward.
ndb/src/mgmapi/ndb_logevent.cpp:
  change the page_size_kb member variable of MemoryUsage to page_size_bytes

ndb/include/mgmapi/ndb_logevent.h

@@ -551,7 +551,13 @@ extern "C" {
       /** Log event specific data for for corresponding NDB_LE_ log event */
       struct {
 	int      gth;
-	unsigned page_size_kb;
+        /* union is for compatibility backward.
+         * page_size_kb member variable should be removed in the future
+        */
+        union {
+	  unsigned page_size_kb;
+          unsigned page_size_bytes;
+        };
 	unsigned pages_used;
 	unsigned pages_total;
 	unsigned block;

ndb/src/mgmapi/ndb_logevent.cpp

@@ -256,7 +256,7 @@ struct Ndb_logevent_body_row ndb_logevent_body[]= {
   ROW( ReceiveBytesStatistic, "mean_received_bytes", 2, mean_received_bytes),
 
   ROW( MemoryUsage, "gth",          1, gth),
-  ROW( MemoryUsage, "page_size_kb", 2, page_size_kb),
+  ROW( MemoryUsage, "page_size_bytes", 2, page_size_bytes),
   ROW( MemoryUsage, "pages_used",   3, pages_used),
   ROW( MemoryUsage, "pages_total",  4, pages_total),
   ROW( MemoryUsage, "block",        5, block),