Marwan Sulaiman 45eeef244e ipn, ipn/ipnlocal: add Foreground field to ServeConfig
This PR adds a new field to the ServeConfig which maps
WatchIPNBus session ids to foreground serve configs.

The PR also adds a DeleteForegroundSession method to ensure the config
gets cleaned up on sessions ending.

Note this field is not currently used but will be in follow up work.

Updates #8489

Signed-off-by: Marwan Sulaiman <marwan@tailscale.com>
2023-09-05 15:10:11 -04:00
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