Added features

[giuliolibrando]

• I've added the functionality requested in issue #615 and issue #616

615:

• If a project has consumable attributes and the allocations inside the project have the same consumable attribute and type, the project attribute is automatically updated
  

616:

• Added the capability to autoupdate an Allocation Attribute Usage (if it's consumable) by adding automatic checks provided by admin. The function converts %SLURM_ACCOUNT_NAME% with slurm_account_name inside the allocation attribute if present.
  
  The command is executed each hour on the host system for each allocation that has a consumable attribute and a usage command not null.
  It requires redis-server and django-q worker.
  commands to start it:
  redis-server
  python manage.py qcluster
  DEBUG=True coldfront runserver

• I've added a docker-compose stack (nginx, coldfront-web, coldfront-worker, redis, mariadb)
  chmod +x entrypoint.sh
  docker-compose up --build

• I've configured the app to be exposed correctly via gunicorn

• I've implemented the is_changeable Project Attribute type functions. It was present but not used in the software logic.

• I've created and added it to Coldfront plugins folder a generic storage plugin to dump the storage allocations, storage_group_name and status
  https://github.com/giuliolibrando/coldfront-plugin-storage

• I've added is_default attribute for project attribute type. If true, the attribute is added to all new projects. it also asks for a default value