Drop dependency on netifaces

The netifaces library was abandoned and retired. Replace it by psutil
which is already part of the dependencies.

Note that localhost_supports_ipv6 from openstacksdk should be mocked
now because it uses psutil in recent versions.

Closes-Bug: #2071596
Change-Id: If9268cab8c2b3098d757571c6cab07d13d34a2c2

requirements.txt

@@ -18,7 +18,6 @@ Paste>=2.0.2 # MIT
 PrettyTable>=0.7.1 # BSD
 alembic>=1.5.0 # MIT
 netaddr>=0.7.18 # BSD
-netifaces>=0.10.4 # MIT
 paramiko>=2.7.1 # LGPLv2.1+
 iso8601>=0.1.11 # MIT
 jsonschema>=4.0.0 # MIT