Disable processing of wireless interfaces on updates

Disable the processing of wireless interfaces on all scripts other than
netinstall (where initial configuration can take place). This is the
start of checking for CAPsMAN management.

Relates to #3

templates/parts/interfaces.rsc.t

@@ -34,6 +34,11 @@
 
 {{-   end }}
 
+{{-   if (and (eq $i.type "wireless")
+              (not (eq (ds "host").export "netinstall"))) }}
+{{-     continue }}
+{{-   end }}
+
 set [ find where name={{ $i.name }} ] \
 {{-   if (or (eq (ds "host").export "netinstall")
              (eq (ds "host").export "mtu")) }}