The parameter should take the values #t, #f or 'default.
In a container environment, 'default amounts to #f, otherwise it
amounts to #t.
* gnu/services/base.scm (guix-configuration)<chroot?>: New field.
(guix-shepherd-service): If chroot? is #f, add "--disable-chroot".
If it is #t or 'default, do nothing.
* gnu/system/linux-container.scm (containerized-operating-system):
If chroot? is 'default, replace it by #f.
* doc/guix.texi: Document the parameter.
Change-Id: I8b9c3f46ad8650fa6ed4acee947b4ae5d002d03d
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