Allow to enter Ansible variables on host in YAML format.
Use codemirror (http://codemirror.net) to make editing YAML easier.

JIRA INFRA-412

JIRA INFRA-302

- 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

On page load we have to check the machine type to enable / disable
item_id and check / uncheck the random MAC

"type" field on host replaced with foreign key "machine_type_id"

JIRA INFRA-281

The network range defines the IP to be allocated.
This is to reserve some specific addresses (for gateway for example).

An admin user should be able to define an interface outside the network
range.

The IP address select field was replaced with a string field
(initialized to the first available IP).

Fixes INFRA-200

Fixes INFRA-197

The interface name shall start with the hostname of the host it is
associated to.

Note that this is only enforced via the UI (from which most users will interact),
not from the API.

Fixes INFRA-195

Use endpoint argument to avoid collision with flask-admin Network

- disable item field for virtual hosts
- pre-fill interface name with hostname

- Main blueprint used to declare custom views for all blueprints.
(keep inventory blueprint cleaner)
- Add url_prefix to each blueprint