Add new option that allows user's to specify mysqldump arguments per database, when file-per-database is true
#arg-per-database is only used if file-per-database is true
## takes a json object {"table1": "--arg", "table2": "--arg"}
arg-per-database = {"employee1": "--no-data"}
Add new option that allows user's to specify mysqldump arguments per database, when
file-per-database
is trueFixes #180