pfSense

Move this global declaration to the proper file rather than backend code

Help ticket #3449:

Improve data validation to avoid save a host/subnet or a IPv4 with
invalid mask. The reported error is on javascript and only happen on
IE8,but this fix will prevent the same issue happening in the future on
a different browser.

Use correct parameter (bootfile-url) to configure netboot on DHCPdv6, it fixes #3421

Fix typo on variable name and really add custom options for dhcpdv6

Normally when an ip is set the interface comes up on BSD stacks. Though push this commit which Fixes #3281

Whitespace fix

Use htmlspecialchars(), a better solution for #2952

Grab exec result just to be careful

Put a kludge for now which Fixes #3280. It should be improved later on to have proper handling and overloading of configuration functions

Consider setting of noconcurrent login for passthrough expiry of users. Fixes #3340