Some switches list only their member ports, each tagged with the trunk
it belongs to, and never the trunk itself. procurve over CLI is one:
`show interfaces brief` has `3-Trk3` and `4-Trk3` but no `Trk3`. Its
REST path already built the trunk row itself, in code no other driver
could reach.
Grouping members by `trunk_group` into one entry per group is the same
for every vendor, so it lives here once. The entry is up/enabled if any
member is, its speed is the members' sum, and `lag_members` is in port
order. A LAG the driver already reported is left alone.
`lag_mode` is set only when the driver passes it. netOrk shows a missing
mode as "static trunk", but a guessed "trunk" would label an LACP group
wrongly, and a label that looks sure when nothing is known is worse.
A free function, not a SwitchDriver method: role bases are declarations
only (test_role_contracts), like normalize_cidr beside DhcpServerMixin.
christianmanivong
f3fa75bbca