HPCC-12242 Trace slow MP accept & connect's

Add tracing to initial MP accept and connect reads to highlight
stalls.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #6485 from jakesmith/hpcc-12242

HPCC-12242 Trace slow MP accept & connects

Reviewed-By: Mark Kelly <mark.kelly@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>