Gyuricska Milán / cloud

This reverts commit 22b41546

Added a variable in settings. It gets the value from an environment variable. The scheduler choose the method using this value.

Using join method on the nodes list instead of string concatenation. Logging if monitor info unreachable or None in get_monitor_info method.

Turned off the autoescape for the variable which cointains the html tag.

Each node, which has unreachable monitor info shown in one error message.

The page now loads when the node can't reach the monitor info values e.g. cpu percent. It gets a default value 0. And if a node's monitor info unreachable shows
an error message.

If the monitor info can't get the values, the values get default 0.

Add new environment variable (MAX_NODE_CPU_RAM) in settings/base.py. Using this variable in dashboard/forms.py as maximal value of cpu cores.

commands: init command extended with default node, users, groups, permissions and detects kvm hardware acceleration presence.

* adds default node
* adds test groups: 'Administrators', 'Powerusers', 'Users'
* adds test users: 'admin', 'poweruser', 'user'
* adds KVM present notification for Administrator
* shares 'vm' network with groups

Suggestion to eleminate RequestContext: https://docs.djangoproject.com/en/1.11/ref/templates/upgrading/#django-template-loader

dashboard, circle: register django autocomplete light and load static content for FilteredSelectMultiple widget on the proper way

dashboard, circle, network, request: upgrade and rework autocompletion, remove deprecated 'pattern' from url patterns

Changes:
* Use argparse instead of optparse: https://docs.djangoproject.com/en/1.11/releases/1.10/#features-removed-in-1-10
* convert print to self.stdout.write(), Django documents suggest it: https://docs.djangoproject.com/en/1.11/howto/custom-management-commands/#module-django.core.management

django.db.models.field.subclassing.SubfieldBase removed: https://docs.djangoproject.com/en/1.11/releases/1.10/#features-removed-in-1-10
New field classes require to call full_clean() method on Models, because the to_python() din't call automatically.
Related docs: https://docs.djangoproject.com/en/1.11/releases/1.8/#subfieldbase

dashboard, vm: fix user handling i tests, new Origin type cannot implicit convert to str, fix redirect_chain in 2FA tests, importing vm operation in __init_.py is unnecessary and and brokes the application

circle, common, dashboard, firewall, request: fix deprecated context and cache handling, get_models, and max_length type for ConnectCommand name

Details:
* get_models removed: https://docs.djangoproject.com/en/1.11/releases/1.7/#introspecting-applications
* post_syncdb removed: https://docs.djangoproject.com/en/1.11/releases/1.9/#features-removed-in-1-9
Alternative: post_migrate: https://docs.djangoproject.com/en/1.11/ref/signals/#post-migrate
* django.contrib.contenttypes.generic removed: https://docs.djangoproject.com/en/1.11/releases/1.9/#features-removed-in-1-9
GenericForeignKey and GenericRelation moved to django.contrib.contenttypes.fields module