+ yaml mode

Use the before_flush hook to trigger the core services update.
It's much nicer than having to call a method in several places.

The core services update is triggered on creation/modification/deletion
of an Interface.

In the before_flush we can manipulate the session (add objects) but we
shouldn't call commit.
The db.session.commit() was removed from the launch_task method.

https://black.readthedocs.io/en/stable/

Add new jinja2 filter to format datetime

Avoid calling the database several times.
Several attributes can be updated in one call.

Only save exceptions that occur before the AWX job was triggered.
If the AWX job failed, we can refer to the logs on AWX.

Allow to display tasks

JIRA INFRA-403

Table used to save the RQ background jobs

JIRA INFRA-403

JIRA INFRA-402

Memory shall be passed in MB and GB

Change "CSentry" to "CSEntry-test" in the navbar (upper left corner)
and set it to red on the staging server.

This is done by setting the variable CSENTRY_STAGING to True in the
settings.cfg file for the staging server (variable set to False by
default).

JIRA INFRA-347

JIRA INFRA-302

a "startsWith" was inserted by commit 1a2f3786
This is the javascript syntax. In Python, it should be lowercase
"startswith"...

Passing tags as kwarg to the InterfaceForm doesn't work because
obj takes precedence (but interface.tags contain Tag instances and not id)
We need to update the default values. Calling process is required.
See https://stackoverflow.com/questions/5519729/wtforms-how-to-select-options-in-selectmultiplefield

JIRA INFRA-334

Both AWX_VM_CREATION_ENABLED and AWX_JOB_ENABLED shall be set to True
to enable VM creation.
An extra variable is used because the core services can be updated from
csentry-test but VM creation shouldn't (for now)

Allow to create a VM or Virtual IOC

"gateway" tag removed. It could be re-added if needed to overwrite the
default computed gateway for example.

JIRA INFRA-339

A new template 'ics-ans-core @ DHCP test' was created to test
the DNS and DHCP deployment. This is the one o use by default.

The "real" template should be used in the production settings.cfg

Tags and device_types are used as key in Ansible roles.
They shouldn't contain any spaces to avoid issues.

JIRA INFRA-334

AWX jobs should only be triggered on the production server (not from
staging). At least until we get a full staging environment.

- rename physical to physical machine
- IOC should be a tag

JIRA INFRA-302

- RQ Dashboard shall only be accessible to admin users
- "REDIS_URL" is hard-coded in rq-dashboard (had to rename RQ_REDIS_URL)

The "REDIS_URL" variable is hard-coded in RQ Dashboard.

REDIS_URL was used by redis_store that is passed to Flask Session.
The url variable used by Flask-Redis can be changed by setting the
config_prefix.

1. Rename REDIS_URL to SESSION_REDIS_URL
2. Rename redis_store to session_redis_store
3. Use "SESSION_REDIS" config_prefix to initialize session_redis_store

This makes it clear that this Redis instance is used by Flask-Session.
REDIS_URL will be used for RQ.

This is to be used for stack of switches only

- a stack_member is linked to an host (device_type has to be "Switch")
- a stack_member is an integer between 0 and 9 (included) or can be None
- the couple (host_id, stack_member) must be unique

JIRA INFRA-267

- rename "Virtual" to "Virtual Machine"
- add "Virtual IOC"
- add several physical devices (Switch, Industrial PC IOC, MicroTCA,
  VME, PLC)

1. When we have a stack of switches, the same IP is associated to several
   switches
2. Move the items <-> host assocation to the item create/edit page

JIRA INFRA-267

The interface name doesn't need to be displayed in the form as we force
it to the hostname.

We set the interface name to the hostname when submitting the form.
This fixes the copy/paste issue with the mouse that didn't trigger the
keyup event.

JIRA INFRA-287

JIRA INFRA-281

If an error is raised when submitting the form, we should keep the IP
that was entered.

JIRA INFRA-285

The class "is-invalid" is removed on all type=text input
on keyup event.

JIRA INFRA-285