Tox: Hacking: enable extensions H106 and H203
Tox: Hacking: enable extensions H106 and H203

[H106] Don't put vim configuration in source files.
[H203] Use assertIs(Not)None to check for None.

Change-Id: I1837e4d2228740290bb58c92e6e557800843deec

cisco-openstack/tempest,vedujoshi/tempest,cisco-openstack/tempest,masayukig/tempest,Juniper/tempest,masayukig/tempest,vedujoshi/tempest,openstack/tempest,openstack/tempest,Juniper/tempest