Remove user and password options for sql-server

[fulghum]

The --user and --password options to sql-server (whether specified on the command line or in a configuration file) allow users to specify an ephemeral superuser to use for the life of the sql-server process. This is a convenient way to temporarily create a superuser, but has several edge cases that can cause unexpected behavior.

This change removes support for the --user and --password options and instead customers should now explicitly create that user using standard SQL statements for managing users, such as:

CREATE USER myUser@'%' IDENTIFIED BY 'myPassw0rd';
GRANT ALL ON *.* TO myUser@'%';

If user or password is specified in a config file, the sql-server will still startup, but will log a warning. If --user or --password is specified as a CLI argument the sql-server will error out with an error message explaining the change. The reason for the difference in handling is that it may be harder for customers to update config files.

[macneale4]

couple comment updates. Feel free to ship without another read

[coffeegoddd]

@fulghum DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
9dd401c	ok	5937457

version	total_tests
9dd401c	5937457

correctness_percentage
100.0