confd: sort interfaces according to length and name

A list of interfaces: x10 x9 x8 x7 x6 x5 x4 x1 x2 x3 should be sorted in
order with x10 last.  Using the common 'sort -n' would generate: x1 x10
x2 ... so we use version sort.  This way we can ensure that the order of
bridge ports is natural and what end users expect.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/confd/bin/gen-interfaces

@@ -85,13 +85,13 @@ phys_ifaces=$(ip -d -j link show | jq -r '
 	 select(.link_type == "ether") |
 	 select(.group != "internal")  |
 	 select(has("parentbus")) |
-	 .ifname')
+	 .ifname' | sort -V)
 ports=$(ip -d -j link show group port | jq -r '
 	 .[] |
 	 select(.link_type == "ether") |
 	 select(.group != "internal")  |
 	 select(has("parentbus")) |
-	 .ifname')
+	 .ifname' | sort -V)
 ifaces=""
 for phy in $phys_ifaces; do
     found=""