HPCC-9605 - Remove spurious 20s sleep at slave start

Introduced accidentally as part of HPCC-8669 changes

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #4580 from jakesmith/hpcc-9605

HPCC-9605 - Remove spurious 20s sleep at slave start

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>