GitLab

This is an ugly/temp update of vendored github.com/titpetric/factory.

It fixes:
 - invalid savepoint rollback SQL syntax
 - err handling on rollback calls
 - inc. number of tries in case of a (dead)lock (from 3 to 64)
 - better backoff algo for sleep between retries

Due to incompatibilities with update of github.com/titpetric/factory,
we are crippeling db connection handling (MustGet fn) - only supporting
one ("default") connection

All IDs  (uint64) should be encoded as string

Temporary disable gRPC comm between compose and system services

Allows us to perform multiple operations with a single request
under the same transaction.