Don't explicitly invoke ifn_start on new child interfaces (vaps and

subinterfaces) after they are created.  Interfaces are already started
by devd invoking /etc/pccard_ether when they are created, so the explicit
calls in childif_create() resulted in interfaces being started twice.

Note that interfaces created via cloned_interfaces are not explicitly
started but depend on the devd mechanism already.

MFC after:	1 week

etc/network.subr

@@ -1429,9 +1429,6 @@ childif_create()
 			fi
 			${IFCONFIG_CMD} $i name $child && cfg=0
 		fi
-		if autoif $child; then
-			ifn_start $child
-		fi
 	done
 
 	# Create vlan interfaces
@@ -1455,9 +1452,6 @@ childif_create()
 				${IFCONFIG_CMD} $i name $child && cfg=0
 			fi
 		fi
-		if autoif $child; then
-			ifn_start $child
-		fi
 	done
 
 	return ${cfg}