Fix code formatting to conform to the PEP 8 style guide
Merge branch 'master' of https://code.grnet.gr/git/pithos
fix nodes latest_version revision
Workaround to identify proper alchemy url
Not all apps use the same setting name for the pithos backend connection
Migrate against synnefo.settings backend by default
use ``PITHOS_BACKEND_DB_CONNECTION`` as default value for alembic sqlalchemy.urloption.
Refs: #2675
Introduce alembic