Do not set default url in alembic.ini
sqlalchemy url will be dynamically set in alembic config object based onsynnefo.settings.PITHOS_BACKEND_DB_CONNECTION.
use alembic to initialize the backend database
Merge branch 'master' of https://code.grnet.gr/git/pithos
Merge with pithos-migrate
Conflicts: snf-pithos-backend/pithos/backends/lib/sqlalchemy/alembic.ini
Update alembic .ini
Migrate against synnefo.settings backend by default
use ``PITHOS_BACKEND_DB_CONNECTION`` as default value for alembic sqlalchemy.urloption.
Pithos alembic migration wrapper tool
Remove index on cluster
Refs: #2675
Write more realistic tests
Introduce alembic
eliminate nested sql aggregations
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