[strace/strace] tests/pidns.c: skip some namespace tests in chroot (#190)

[J Farkas]

Yes, that's my point - just like unshare() with some options in pidns_test_init(), these ioctls are supposed to fail with EPERM in chroot.  The unshare() code path later checks and makes the test skip, but the ioctls fail and cause a test suite failure.

The pull request is adjusting the conditions so that the ioctl failure (when expected to fail), will make the test skipped instead of failing.

Perhaps a similar effect would be to move check_ns_ioctl() down so that it's not run at all when unshare() failed?

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