other pep8 fixes changed default database username for db tests
other pep8 fixes
changed default database username for db tests


Former-commit-id: 19d29444ea75ebdc5cb37f905c38e6b5e4255d42 [formerly d8f68e26ff6c88422cbdbc5bf61c2fa54c79f0d5]
Former-commit-id: 6107186382e556d0e0db5157722d9b48c0f4dd10
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine