This patch adds a Guix Home service, which allows for configuring/deploying an
operating-system declaration with an associated home-environment.
* gnu/services/guix.scm: Add guix-home-service and guix-home-shepherd-service
* gnu/home/services/shepherd.scm: Don't attempt to launch user shepherd when
the system shepherd runs guix-home-<user>
* doc/guix.texi: Add documentation for guix-home-service
* gnu/tests/guix.scm: Add a test to verify guix-home-service-type is able to
activate a home environment
Change-Id: Ifbcc0878d934aa4abe34bb2123b5081fb432aa8e
Signed-off-by: Ludovic Courtès <ludo@gnu.org>