util: create a script to populate DB with quota info

[mvidalgarcia]

The script can be written in Python and executed in reana-server. It should create enough data to test our tasks. Some objects it can create (make sure to not double create them, i.e. create if not exists):

Resource:

• CPU
• HDD

ResourceUser:

• Iterate over all users and set some sensible quota_used and quota_limit.

[diegodelemos]

This could be implemented as new command in reana-db CLI e.g. reana-db quotas init. Then added as a new instruction in R-S's create-database.sh so this would work out of the box with reana-dev run-ci.