[PYTHON-1450] PyMongo should error on username or password with unescaped '%' characters - MongoDB Jira

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PyMongo fails the following test from the updated connection string spec tests:

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FAIL: test_connection_string_test_invalid-uris (test.test_uri_spec.TestAllScenarios)

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Traceback (most recent call last):

  File "test/test_uri_spec.py", line 55, in run_scenario

    "Test failure '%s'" % dsc)

AssertionError: Test failure 'Username with password containing an unescaped percent sign'

The problem is Python's unquote(_plus) happily ignores unescaped % characters.

is depended on by

DRIVERS-349 Resync connection string spec tests for percent encoding in userinfo

PYTHON-1579 Allow unencoded subdelimiters in usernames and passwords