Don't set EPOLLOUT when creating TCP sockets

[ThadHouse]

Description

Epollout shouldn't be set until a pending send is available.

Testing

Not easy to test because there isn't really a failure case, but the UDP side explicitly adds epollout only when needed.

Documentation

N/A

[nibanks]

Lots of BVT failures

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.96%. Comparing base (fb96220) to head (75368f1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4542      +/-   ##
==========================================
- Coverage   86.41%   85.96%   -0.46%     
==========================================
  Files          56       56              
  Lines       15530    15530              
==========================================
- Hits        13421    13351      -70     
- Misses       2109     2179      +70     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ThadHouse]

I guess you actually do need epollout set for connect() to work.