Tests optimization

[renatomassaro]

Our tests run quite smoothly (~900 tests in ~28 seconds on a machine with modern CPU + SSD), however there are some optimizations that can be performed to reduce that number to 20 seconds. This task is intended to list these optimizations and brainstorm for new ones.

• Reduce bcrypt rounds to 0. Done at Glue storyline setup with account setup #360
• More efficient string generation algorithm (a very simple and localized PoC reduced total test time in 1s)