selftests/bpf/xdp_redirect_multi: Limit the tests in netns

As I want to test both DEVMAP and DEVMAP_HASH in XDP multicast redirect, I
limited DEVMAP max entries to a small value for performace. When the test
runs after amount of interface creating/deleting tests. The interface index
will exceed the map max entries and xdp_redirect_multi will error out with
"Get interfacesInterface index to large".

Fix this issue by limit the tests in netns and specify the ifindex when
creating interfaces.

Fixes: d23292476297 ("selftests/bpf: Add xdp_redirect_multi test")
Reported-by: Jiri Benc <[email protected]>
Signed-off-by: Hangbin Liu <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]

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