operating-system's kernel.
* gnu/system.scm (package-for-kernel): New procedure.
(operating-system-directory-base-entries): Use it.
* gnu/tests/linux-module.scm: Test it.
* doc/guix.texi (Linux Services): Add a new subsection and document the
new service and its configuration.
* gnu/services/linux.scm (kernel-module-loader-service-type): New type.
(kernel-module-loader-shepherd-service): New procedure.
* gnu/tests/linux-modules.scm (module-loader-program): Procedure
removed.
(modules-loaded?-program): New procedure.
(run-loadable-kernel-modules-test): 'module-loader-program' procedure
replaced by the new one.
[os]: Use 'kernel-module-loader-service'.
Signed-off-by: Danny Milosavljevic <dannym@scratchpost.org>