Change directory to "/" after --chroot operation.

Thanks to Steve Grubb for suggesting this. He wrote:
=========
I was reviewing something recently and discovered a problem in capsh. The capsh
program has a --chroot command line option. Inspecting the code shows that it does not
do a chdir("/") after calling chroot. This means that '.' is outside the chroot.

Additional info:
http://cwe.mitre.org/data/definitions/243.html
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Signed-off-by: Andrew G. Morgan <morgan@kernel.org>

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