selftests/net: Add additional test coverage in nk_qlease

Add further netkit queue-lease coverage for netns lifecycle of the guest
and physical halves, channel resize across active leases, single-device
and multi-lessee scenarios, L3 mode operation, lease capacity exhaustion,
and corner-cases of e.g. queue-create rejection paths. Also make the tests
more robust by removing the time.sleep(0.1) after netns deletion and turn
them into a wait loop.

Full test run:

  # ./nk_qlease.py
  TAP version 13
  1..45
  ok 1 nk_qlease.test_remove_phys
  ok 2 nk_qlease.test_double_lease
  ok 3 nk_qlease.test_virtual_lessor
  ok 4 nk_qlease.test_phys_lessee
  ok 5 nk_qlease.test_different_lessors
  ok 6 nk_qlease.test_queue_out_of_range
  ok 7 nk_qlease.test_resize_leased
  ok 8 nk_qlease.test_self_lease
  ok 9 nk_qlease.test_create_tx_type
  ok 10 nk_qlease.test_create_primary
  ok 11 nk_qlease.test_create_limit
  ok 12 nk_qlease.test_link_flap_phys
  ok 13 nk_qlease.test_queue_get_virtual
  ok 14 nk_qlease.test_remove_virt_first
  ok 15 nk_qlease.test_multiple_leases
  ok 16 nk_qlease.test_lease_queue_tx_type
  ok 17 nk_qlease.test_invalid_netns
  ok 18 nk_qlease.test_invalid_phys_ifindex
  ok 19 nk_qlease.test_multi_netkit_remove_phys
  ok 20 nk_qlease.test_single_remove_phys
  ok 21 nk_qlease.test_link_flap_virt
  ok 22 nk_qlease.test_phys_queue_no_lease
  ok 23 nk_qlease.test_same_ns_lease
  ok 24 nk_qlease.test_resize_after_unlease
  ok 25 nk_qlease.test_lease_queue_zero
  ok 26 nk_qlease.test_release_and_reuse
  ok 27 nk_qlease.test_veth_queue_create
  ok 28 nk_qlease.test_two_netkits_same_queue
  ok 29 nk_qlease.test_l3_mode_lease
  ok 30 nk_qlease.test_single_double_lease
  ok 31 nk_qlease.test_single_different_lessors
  ok 32 nk_qlease.test_cross_ns_netns_id
  ok 33 nk_qlease.test_delete_guest_netns
  ok 34 nk_qlease.test_move_guest_netns
  ok 35 nk_qlease.test_resize_phys_no_reduction
  ok 36 nk_qlease.test_delete_one_netkit_of_two
  ok 37 nk_qlease.test_bind_rx_leased_phys_queue
  ok 38 nk_qlease.test_resize_phys_shrink_past_leased
  ok 39 nk_qlease.test_resize_virt_not_supported
  ok 40 nk_qlease.test_lease_devices_down
  ok 41 nk_qlease.test_lease_capacity_exhaustion
  ok 42 nk_qlease.test_resize_phys_up
  ok 43 nk_qlease.test_multi_ns_lease
  ok 44 nk_qlease.test_multi_ns_delete_one
  ok 45 nk_qlease.test_move_phys_netns
  # Totals: pass:45 fail:0 xfail:0 xpass:0 skip:0 error:0

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260413220809.604592-4-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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