Rename ifListChanged to localInterfaceListChanged.

That better indicates that it reflects changes to the list of local
interfaces on the system, as supplied by libpcap/WinPcap, not to any
other interface list we maintain, such as lists of remote interfaces, or
the list of non-hidden interfaces.

Change-Id: Idf79b365e07f2e3eaa83c105ae9cd7ace54c435e
Reviewed-on: https://code.wireshark.org/review/3154
Reviewed-by: Guy Harris <guy@alum.mit.edu>