openconnect: avoid using the --juniper switch

The --juniper switch has been deprecated in favour of --protocol=nc. Fix the
proto script thusly, while keeping compatibility with existing configurations.

Note that, as far as UCI is concerned, if both options juniper and vpn_protocol
are specified, the latter takes precedence.

Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>

net/openconnect/files/openconnect.sh

@@ -93,9 +93,9 @@ proto_openconnect_setup() {
 		append_args --no-system-trust
 	}
 
-	if [ "${juniper:-0}" -gt 0 ]; then
-		append_args --juniper
-	fi
+	[ "${juniper:-0}" -gt 0 ] && [ -z "$vpn_protocol" ] && {
+		vpn_protocol="nc"
+	}
 
 	[ -n "$vpn_protocol" ] && {
 		append_args --protocol "$vpn_protocol"