Brad Fitzpatrick 8b3ea13af0 net/tsdial: be smarter about when to close SystemDial conns
It was too aggressive before, as it only had the ill-defined "Major"
bool to work with. Now it can check more precisely.

Updates #9040

Change-Id: I20967283b64af6a9cad3f8e90cff406de91653b8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2023-09-01 09:33:55 -07:00
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