Python: Rename .qll file for mysql-connector-python support

Just like our support for the `PyYAML` PyPI package that you import with
`import yaml` is in `Yaml.qll`.

Since this file does not provide any public predicates/modules, it
should be safe to rename it.

Author: RasmusWL

python/ql/src/semmle/python/Frameworks.qll

@@ -14,7 +14,7 @@ private import semmle.python.frameworks.Flask
 private import semmle.python.frameworks.Idna
 private import semmle.python.frameworks.Invoke
 private import semmle.python.frameworks.Multidict
-private import semmle.python.frameworks.MysqlConnectorPython
+private import semmle.python.frameworks.Mysql
 private import semmle.python.frameworks.MySQLdb
 private import semmle.python.frameworks.Psycopg2
 private import semmle.python.frameworks.PyMySQL

python/ql/src/semmle/python/frameworks/MysqlConnectorPython.qll renamed to python/ql/src/semmle/python/frameworks/Mysql.qll

@@ -20,7 +20,7 @@ private import semmle.python.frameworks.PEP249
  * - https://dev.mysql.com/doc/connector-python/en/
  * - https://dev.mysql.com/doc/connector-python/en/connector-python-example-connecting.html
  */
-private module MysqlConnectorPython {
+private module Mysql {
   // ---------------------------------------------------------------------------
   // mysql
   // ---------------------------------------------------------------------------