User simulator

[aatkin]

Implements simple tool that generates user traffic to target REMS.

Creates headless browser for each simulated user, who login and proceed to navigate into random applications (that belong to the user). Thread daemon attempts to keep all users working, in case the webdriver crashes or something surprising happens.

Some limitations:

• only supports fake login users at the time
• fixed user actions (viewing random application)
• no load test statistics
• no burst traffic

Checklist for author

Remove items that aren't applicable, check items that are done.

Documentation

• Update changelog if necessary (maybe not needed for development tool?)