Summary: ConnID should be set as soon as the ConnTracker is created to avoid CONN_TRACEs with upid=0.

Test Plan: Manually checked the CONN_TRACE logs.

Reviewers: #stirling, yzhao

Reviewed By: #stirling, yzhao

Subscribers: yzhao
Signed-off-by: Omid Azizi <oazizi@pixielabs.ai>

Differential Revision: https://phab.corp.pixielabs.ai/D10842

GitOrigin-RevId: d11ace03d65615ddd91d5d3827546d5f3db46717