Don't use tag=10 for VLAN 10 containers

VLAN 10 is the native (untagged) VLAN. Containers on VLAN 10 should have no tag= setting. Adding tag=10 causes frames to be dropped by the switch.

Only use tag= for containers on non-native VLANs. Discovered during Samba deployment (2026-02-28).
Affected entities:VLAN 10 — Production