Embed pymysql within the collection and use default test container

This change eliminates the need to install the connector on each
controlled node, as `pymysql` version 1.1.1 is now included. As a
result, we can safely assume its availability, thus simplifying the
testing process.

Also, I managed to remove the need for pre-built test containers. We
now use the default test containers from ansible-test.

plugins/module_utils/pymysql/__init__.py

@@ -0,0 +1,183 @@
+"""
+PyMySQL: A pure-Python MySQL client library.
+
+Copyright (c) 2010-2016 PyMySQL contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+import sys
+
+from .constants import FIELD_TYPE
+from .err import (
+    Warning,
+    Error,
+    InterfaceError,
+    DataError,
+    DatabaseError,
+    OperationalError,
+    IntegrityError,
+    InternalError,
+    NotSupportedError,
+    ProgrammingError,
+    MySQLError,
+)
+from .times import (
+    Date,
+    Time,
+    Timestamp,
+    DateFromTicks,
+    TimeFromTicks,
+    TimestampFromTicks,
+)
+
+# PyMySQL version.
+# Used by setuptools and connection_attrs
+VERSION = (1, 1, 1, "final", 1)
+VERSION_STRING = "1.1.1"
+
+### for mysqlclient compatibility
+### Django checks mysqlclient version.
+version_info = (1, 4, 6, "final", 1)
+__version__ = "1.4.6"
+
+
+def get_client_info():  # for MySQLdb compatibility
+    return __version__
+
+
+def install_as_MySQLdb():
+    """
+    After this function is called, any application that imports MySQLdb
+    will unwittingly actually use pymysql.
+    """
+    sys.modules["MySQLdb"] = sys.modules["pymysql"]
+
+
+# end of mysqlclient compatibility code
+
+threadsafety = 1
+apilevel = "2.0"
+paramstyle = "pyformat"
+
+from . import connections  # noqa: E402
+
+
+class DBAPISet(frozenset):
+    def __ne__(self, other):
+        if isinstance(other, set):
+            return frozenset.__ne__(self, other)
+        else:
+            return other not in self
+
+    def __eq__(self, other):
+        if isinstance(other, frozenset):
+            return frozenset.__eq__(self, other)
+        else:
+            return other in self
+
+    def __hash__(self):
+        return frozenset.__hash__(self)
+
+
+STRING = DBAPISet([FIELD_TYPE.ENUM, FIELD_TYPE.STRING, FIELD_TYPE.VAR_STRING])
+BINARY = DBAPISet(
+    [
+        FIELD_TYPE.BLOB,
+        FIELD_TYPE.LONG_BLOB,
+        FIELD_TYPE.MEDIUM_BLOB,
+        FIELD_TYPE.TINY_BLOB,
+    ]
+)
+NUMBER = DBAPISet(
+    [
+        FIELD_TYPE.DECIMAL,
+        FIELD_TYPE.DOUBLE,
+        FIELD_TYPE.FLOAT,
+        FIELD_TYPE.INT24,
+        FIELD_TYPE.LONG,
+        FIELD_TYPE.LONGLONG,
+        FIELD_TYPE.TINY,
+        FIELD_TYPE.YEAR,
+    ]
+)
+DATE = DBAPISet([FIELD_TYPE.DATE, FIELD_TYPE.NEWDATE])
+TIME = DBAPISet([FIELD_TYPE.TIME])
+TIMESTAMP = DBAPISet([FIELD_TYPE.TIMESTAMP, FIELD_TYPE.DATETIME])
+DATETIME = TIMESTAMP
+ROWID = DBAPISet()
+
+
+def Binary(x):
+    """Return x as a binary type."""
+    return bytes(x)
+
+
+def thread_safe():
+    return True  # match MySQLdb.thread_safe()
+
+
+Connect = connect = Connection = connections.Connection
+NULL = "NULL"
+
+
+__all__ = [
+    "BINARY",
+    "Binary",
+    "Connect",
+    "Connection",
+    "DATE",
+    "Date",
+    "Time",
+    "Timestamp",
+    "DateFromTicks",
+    "TimeFromTicks",
+    "TimestampFromTicks",
+    "DataError",
+    "DatabaseError",
+    "Error",
+    "FIELD_TYPE",
+    "IntegrityError",
+    "InterfaceError",
+    "InternalError",
+    "MySQLError",
+    "NULL",
+    "NUMBER",
+    "NotSupportedError",
+    "DBAPISet",
+    "OperationalError",
+    "ProgrammingError",
+    "ROWID",
+    "STRING",
+    "TIME",
+    "TIMESTAMP",
+    "Warning",
+    "apilevel",
+    "connect",
+    "connections",
+    "constants",
+    "converters",
+    "cursors",
+    "get_client_info",
+    "paramstyle",
+    "threadsafety",
+    "version_info",
+    "install_as_MySQLdb",
+    "__version__",
+]