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

[Dmitry V. Levin]

This is how it looks in chrooted environments:
```
$ strace -qq -a24 -esignal=none -eioctl,unshare ./kill--pidns-translation >/dev/null 
ioctl(3, NS_GET_USERNS) = 4
unshare(CLONE_NEWUSER|CLONE_NEWPID) = -1 EPERM (Operation not permitted)
unshare: Operation not permitted
```

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