HPCC-11251 - daliadmin holdlock

For testing purposes, allow a logical file to be locked
temporarily.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
HPCC-11251 - indentation

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #5718 from jakesmith/hpcc-11251

HPCC-11251 - daliadmin holdlock

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>