oslo.db release 0.5.0

Change log:

c785bee Updated from global requirements
ac05c2a Imported Translations from Transifex
57f499e Add a check for SQLite transactional state
bdcfb4a Let oslotest manage the six.move setting for mox
4ed63fa Fix DBReferenceError on MySQL and SQLite
49ae6c0 Renaming in WalkVersionsMixin
cae1202 Clean up documentation
fb577ec Use single quotes for db schema sanity check
ab47516 warn against sorting requirements
be6f9a0 ModelsMigrationsSync:Override compare_server_default
e187a4c Updated from global requirements
cbf995e Imported Translations from Transifex
f2f0960 Add doc8 to tox environment docs
92d9a1c Use oslo.i18n
78fd290 Repair pysqlite transaction support
41dada1 Extract logging setup into a separate function
7c57798 Updated from global requirements
977869d Remove reliance on create_engine() from TestsExceptionFilter
626d762 Consolidate sqlite and mysql event listeners
5ab43ee Use dialect dispatch for engine initiailization.
4683475 Add get_non_innodb_tables() to utils
686005e Added check to see whether oslotest is installed
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