HPCC-9117 Stopping of dafilesrv generates odd message

Can get message /etc/init.d/dafilesrv: line 140: [: missing `]'

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4225 from richardkchapman/dafilesrv-initissue

HPCC-9117 Stopping of dafilesrv generates odd message

Reviewed-By: Philip Schwartz <philip.schwartz@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>