pfSense

Teach mwexec and mwexec_bg how to optionally clear signal masks, and use that when launching ntp or ntpdate.

On its own, ntpd does not sync fast enough at bootup, so bring back the ntpdate sync but improve it so it can't get stuck forever.

Clear process signals before exec() or ntpd misbehaves if called from PHP on i386.

As suggested by wagonza, using SAMEORIGIN for X-Frame-Options is sufficient here, and does allow the traffic graphs to work. Fixes #2419

Use FreeBSD's ntpd instead in the backend

Fix ntp name here too

Whoops, don't flip these since I negated the test.

Flip this test around since it's safer to assume the dev mode is tun. Ticket #2432

allow port in virtual servers to be left blank

in which case listening port would be inherited from the pool

allow aliases for the ipaddr field in virtual servers (PEV-394754)