HPCC-9163 Get cloned remote file descriptor once per CResolvedFile

For cloned files the remote file descriptor was being retrieved
from dali for each file activity.  The descriptor should be retrieved
only once when the CResolvedFile is created, and the roxie
dali helper to avoid issues if dali is down.

Signed-off-by: Anthony Fishbeck <Anthony.Fishbeck@lexisnexis.com>