HPCC-11801 ERROR: Query suspended: Different version of file already loaded

Need to clear the keystore cache after the delayed release has happened -
clearing it before will have no effect, as it only clears entries that are not
in use.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6157 from richardkchapman/roxie-keycache-delay

HPCC-11801 ERROR: Query suspended: Different version of file already loaded

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>