Remove all (most) references to mycli

[meeuw]

$ git grep -i mysql

litecli/completion_refresher.py:    # schemata - In MySQL Schema is the same as database. But for mycli
litecli/lexer.py:from pygments.lexers.sql import MySqlLexer
litecli/lexer.py:class LiteCliLexer(MySqlLexer):
litecli/liteclirc:# MySQL prompt
litecli/main.py:    help="Read MySQL config groups with the specified suffix.",
litecli/packages/special/dbcommands.py:        # Fallback in case query fail, as it does with Mysql 4
litecli/packages/special/dbcommands.py:    # prepare in case keys are bytes, as with Python 3 and Mysql 4
tests/liteclirc:# MySQL prompt
tests/liteclirc:# \t - Product type (Percona, MySQL, MariaDB)
tests/utils.py:    reason="Need a mysql instance at localhost accessible by user 'root'",