olslo.db release 0.4.0

Changes:

ee176a8 Implement a dialect-level function dispatch system
6065b21 Move to oslo.utils
deeda38 Restore correct source file encodings
4dde38b Handle DB2 SmallInteger type for change_deleted_column_type_to_boolean
4c18fca Imported Translations from Transifex
69f16bf Fixes comments to pass E265 check.
e1dbd31 Fixes indentations to pass E128 check.
423c17e Uses keyword params for i18n string to pass H703
3cb5927 Adds empty line to multilines docs to pass H405
0996c5d Updates one line docstring with dot to pass H402
a3ca010 Changes import orders to pass H305 check
584a883 Fixed DeprecationWarning in exc_filters
fc2fc90 Imported Translations from Transifex
3b17365 oslo.db.exceptions module documentation
c919585 Updated from global requirements
4685631 Extension of DBDuplicateEntry exception
7cb512c oslo.db.options module documentation
c0d9f36 oslo.db.api module documentation
93d95d4 Imported Translations from Transifex
e83e4ca Use SQLAlchemy cursor execute events for tracing
d845a16 Remove sqla_07 from tox.ini
9722ab6 Updated from global requirements
3bf8941 Specify raise_on_warnings=False for mysqlconnector
1814bf8 Make MySQL regexes generic across MySQL drivers
62729fb Allow tox tests with complex OS_TEST_DBAPI_CONNECTION URLs
a9e3af2 Raise DBReferenceError on foreign key violation
b69899e Add host argument to get_connect_string()
9a6aa50 Imported Translations from Transifex
f817555 Don't drop pre-existing database before tests
4499da7 Port _is_db_connection_error check to exception filters
9d5ab2a Integrate the ping listener into the filter system.
cbae81e Add disconnect modification support to exception handling
0a6c8a8 Implement new exception interception and filtering layer
69a4a03 Implement the SQLAlchemy ``handle_error()`` event.
f96deb8 Remove moxstubout.py from oslo.db
7d78e3e Added check for DB2 deadlock error
2df7e88 Bump hacking to version 0.9.2
c34c32e Opportunistic migration tests
108e2bd Move all db exception to exception.py
35afdf1 Enable skipped tests from test_models.py
e68a53b Use explicit loops instead of list comprehensions
44e96a8 Imported Translations from Transifex
817fd44 Allow usage of several iterators on ModelBase
baf30bf Add DBDuplicateEntry detection for mysqlconnector driver
4796d06 Check for mysql_sql_mode is not None in create_engine()
01b916c remove definitions of Python Source Code Encoding
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