HPCC-8669 - Extend NAS mapping options

Allow a range as opposed to a subnet/mask to be defined for a
filter and allow a source range to apply also.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #4110 from jakesmith/hpcc-8669

HPCC-8669 - Extend NAS mapping options

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>