Problem: WAIT_UNTIL_SQL_THREAD_AFTER_GTIDS, WAIT_FOR_EXECUTED_GTID_SET
and MASTER_POS_WAIT functions take an optional "timeout" parameter.
When supplied with a timeout parameter that is anything other than
a positive integer or zero, the server behaves oddly.

Analysis: The timeout parameter was treated and read as positive integer.
i.e., -1 became '0', 0.4 became '0', 1.4 becomes '1'. Hence the
server was behaving wrongly with the negative and fractional timeout values.

Fix: For negative values,
        > If SQL_MODE is strict mode then it will throw ER_WRONG_PARAMETERS
          error.
        > If SQL_MODE is non-strict value then it returns NULL immediately
          without doing any wait and generates ER_WRONG_PARAMETERS warning.
     For fractional value,
       > it is read as it is and no rounding off to near by integer
         i.e., 1.3 will be read as 1.3 and it will wait for 1.3 seconds.