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 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@'%';

[coffeegoddd]

@fulghum DOLT

comparing_percentages
100.000000 to 100.000000

version	result	total
ae8ed37	ok	5937457

version	total_tests
ae8ed37	5937457

correctness_percentage
100.0