* nxos_snmp_traps: fix 'group: all' for N35 platforms
- `group: all` attempts to enable traps for all features defined in the module's `feature_list`
- `N35` platforms do not support `snmp-server enable traps bfd`; so removing `bfd` from the `feature_list` for that platform
- Minor cleanup in `sanity.yaml` test file
* whitespace lint fix
(cherry picked from commit 0e0c2a7db7)
