tests/shell: Test for fixed extension registration

Use strace to look at iptables-restore behaviour with typically
problematic input (conntrack revision 0 is no longer supported by
current kernels) to make sure the fix in commit a1eaaceb0460b
("libxtables: Simplify pending extension registration") is still
effective.

Signed-off-by: Phil Sutter <phil@nwl.cc>
1 file changed