JR45673 Suppress and demote MetaData mismatch warnings of column.type, column.scale, column.precision

Added an option to suppress or demote all the metadata mismatch warnings. 
To enable the change, add a user defined environment variable 
DSODBC_NO_METADATA_WARNINGS and set its value to 1 or 2.
DSODBC_NO_METADATA_WARNINGS=1   suppress all the warnings
DSODBC_NO_METADATA_WARNINGS=2   demote all the warnings to informational
DSODBC_NO_METADATA_WARNINGS overrides DSODBC_NO_BIGINT_WARNINGS.