- Remove extra handler - flask default handler is fine (everything was
  logged twice due to changes in flask 1.0)
- Add more logging messages

JIRA INFRA-2899 #action In Progress

This is for admin only.
Note that deleting a network with existing hosts is not allowed.
Same for domain, network scope...
Will make testing csentry-api easier by allowing to reset the db during
tests.

JIRA INFRA-1853 #action In Progress

Sensitive hosts shall not be returned in search and get queries (both
web and API) for non admin users

JIRA INFRA-1671

Endpoints required to update host and interface via the API

JIRA INFRA-1406 #action In Progress

- requesting too many elements in one query has an impact on the
database and the web application
- max limit set to 100

JIRA INFRA-942 #action In Progress

JIRA INFRA-931 #action In Progress

- add fqdn to host
- add gateway to network
- add netmask to interface
- allow to pass recursive via the API (to expand interfaces in host)
- add is_main property to interface (True if the interface is the main
  interface of the host)

JIRA INFRA-640

Add endpoints:
DELETE /network/hosts/<host_id>
DELETE /network/interfaces/<interface_id>

JIRA INFRA-570 #action In Progress

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

Pagination information (next, prev, first, last) is included in the Link
HTTP header.
The total number of entries is provided in the X-Total-Count HTTP
header.

+ fix tests

Split API in different blueprints like for the web UI:
- users (login)
- inventory
- network

Use version in API url (api/v1) to make future changes easier without
breaking backward compatibility