Restore the RADIUS NAS ID option to Captive Portal. Fixes #8998
Keeps the default of using CaptivePortal-<zonename> when not set,otherwise uses the value supplied by the user as with older versions.
(cherry picked from commit b1cc8f3143f7253bb3acdcdf8c18f9effaf3bce5)
Restore the RADIUS NAS ID option to Captive Portal. Fixes #8998
Keeps the default of using CaptivePortal-<zonename> when not set,
otherwise uses the value supplied by the user as with older versions.
(cherry picked from commit b1cc8f3143f7253bb3acdcdf8c18f9effaf3bce5)