Remove loopback restriction

It's occasionally useful, and we already warn when setting it.

lib/msf/ui/console/command_dispatcher/core.rb

@@ -2161,8 +2161,7 @@ class Core
   # XXX: We repurpose OptAddressLocal#interfaces, so we can't put this in Rex
   def tab_complete_source_interface(o)
     return [] unless o.is_a?(Msf::OptAddressLocal)
-    # Exclude loopback generically
-    o.interfaces - %w{lo lo0}
+    o.interfaces
   end
 
   #

lib/rex/ui/text/dispatcher_shell.rb

@@ -290,10 +290,8 @@ module DispatcherShell
       addresses = [Rex::Socket.source_address]
       # getifaddrs was introduced in 2.1.2
       if ::Socket.respond_to?(:getifaddrs)
-        ifaddrs = ::Socket.getifaddrs.find_all do |ifaddr|
-          ((ifaddr.flags & ::Socket::IFF_LOOPBACK) == 0) &&
-            ifaddr.addr &&
-            ifaddr.addr.ip?
+        ifaddrs = ::Socket.getifaddrs.select do |ifaddr|
+          ifaddr.addr && ifaddr.addr.ip?
         end
         addresses += ifaddrs.map { |ifaddr| ifaddr.addr.ip_address }
       end