selftests: forwarding: vxlan_bridge_1q: Remove unused function

Remove `vxlan_ping_test()` which is not used and probably was copied
mistakenly from vxlan_bridge_1d.sh.

This was found while adding an equivalent test for IPv6.
Signed-off-by: Amit Cohen <amcohen@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/forwarding/vxlan_bridge_1q.sh

@@ -680,26 +680,6 @@ test_pvid()
 	log_test "VXLAN: flood after vlan re-add"
 }
 
-vxlan_ping_test()
-{
-	local ping_dev=$1; shift
-	local ping_dip=$1; shift
-	local ping_args=$1; shift
-	local capture_dev=$1; shift
-	local capture_dir=$1; shift
-	local capture_pref=$1; shift
-	local expect=$1; shift
-
-	local t0=$(tc_rule_stats_get $capture_dev $capture_pref $capture_dir)
-	ping_do $ping_dev $ping_dip "$ping_args"
-	local t1=$(tc_rule_stats_get $capture_dev $capture_pref $capture_dir)
-	local delta=$((t1 - t0))
-
-	# Tolerate a couple stray extra packets.
-	((expect <= delta && delta <= expect + 2))
-	check_err $? "$capture_dev: Expected to capture $expect packets, got $delta."
-}
-
 __test_learning()
 {
 	local -a expects=(0 0 0 0 0)