selftests: tc-testing: use $IP in hfsc test 8c39 setup

Test 8c39 brings up lo with a bare "ip" command. nsPlugin runs it as
"$IP netns exec <ns> ip ...", and as tdc runs commands with an empty
environment, "ip netns exec" searches only the default execvp() path
(/bin:/usr/bin). On systems that install ip only in /sbin, like Fedora,
the setup fails:

  # ./tdc.py -e 8c39
  Test 8c39: HFSC classify walk still reaches leaf after lateral drift
  -----> prepare stage *** Could not execute: "ip link set lo up"
  -----> prepare stage *** Error message: "exec of "ip" failed: No such file or directory

Use $IP like all other tdc tests do.

Fixes: 1e24c4f2ee44 ("selftests: tc-testing: add a lateral-drift hfsc classify-walk test")
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Reviewed-by: Victor Nogueira <victor@mojatatu.com>
Reviewed-by: Hangbin Liu <liuhangbin@kylinos.cn>
Link: https://patch.msgid.link/20261014121414.2373985-1-ivecera@redhat.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

0 files changed, 0 insertions, 0 deletions