pfSense

When loading a configuration file from a different device (with other
NICs) to a freshly installed pfSense, it correctly detects a mismatch of
the network interfaces and redirects the user to the interface setup
page. If there are VLANs defined in the loaded config, the VLANs are
still bound to the non-existent NICs, thus the user has to open the VLAN
assigning page and correct this. Pressing then on save, pfSense executes
the change immediately leading under unlucky conditions to the loss of
the connection to the admin interface of pfsense.

In my opinion if pfsense discovers a mismatch in interface assignment
after restoring a configuration file, the changes made by the user to
VLANs and interface assignment should not happen immediately. It should
let the user finish all the reassignment work and then do the reboot of
the device like it does it always after restoring a config.

How to reproduce:
- do a fresh pfsense installation and boot, connect to the web-gui
- instead of following the presented wizard, chose Diagnostics >
Backup/Restore from the menu
load a config using VLANs originating from a different device, which
has other kind of NICs built in (different brand e.g.)
- when presented with the interface assignment page, change to the VLAN
page and reassign a VLAN to the inner interface
- press save