* Update nxos tests that got missed in the first pass * Add setup for setting interfaces to layer2
On setup we set it to 'switch', so teardown should be 'switch'. Also, using inventory_hostname breaks the test, since in our CI it's a long UUID string, which exceeds the 32 chars maximum for setting a hostname on NXOS.
* refactor nxos_system * refactor nxos_user * refactor nxos_vlan * refactor nxos_vrf