Fix to problem where WRITE_ROW error 121 was seen by MySQLD when Inserting 
rows into the ndb_binlog_index table.

The problem was due to the Ndb storage engine handler calling the wrong 
overloaded variant of a Server internal Api.  This resulted in the 
64-bit integer epoch being mapped to a 64-bit double precision floating
point number, with a loss of accuracy for numbers greater than 2^53.  
The loss of accuracy results in duplicate key errors when the number is
used as a key.

A testcase is added which verifies that large epoch values do not 
result in duplicates. 

Other incorrect usage of the Field::store() api is corrected here.