services: Add libvirt services

* gnu/services/virtualization.scm: New file.
* doc/guix.texi (Virtualization Services): Document it.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

Signed-off-by: Christopher Baines <mail@cbaines.net>

gnu: libvirt: Wrap with iproute and qemu.

libvirtd runs qemu if it's configured to use it, and also uses the ip command.

* gnu/packages/virtualization.scm (libvirt)[arguments]: Add wrap-libvirtd
  phase.

gnu: Build the shared library for yaml-cpp.

* gnu/packages/serialization.scm (yaml-cpp)[arguments]: Add
  -DBUILD_SHARED_LIBS=ON to #:configure-flags.

services: herd: Actions return a list of results.

Fixes a regression introduced in
0642838b2e9ab2bd988dccb64b9e1130006347bf.

* gnu/services/herd.scm (invoke-action): Explain that we get a list of
results.
(current-services): Expect a list of result and use the first one.
(unload-service, %load-file, eval-there): Likewise.

gnu: whois: Update to 5.2.18.

* gnu/packages/networking.scm (whois): Update to 5.2.18.

bash completion: Complete files names after 'guix download'.

* etc/completion/bash/guix (_guix_complete): When the command is "download",
use __guix_complete_file.

gnu: Add f2fs-tools.

* gnu/packages/linux.scm (f2fs-tools): New variable.

gnu: Add icedtea-web.

* gnu/packages/java.scm (icedtea-web): New variable.

gnu: gnurl: Update to 7.55.1-3.

* gnu/packages/gnunet.scm (gnurl): Update to 7.55.1-3.

Signed-off-by: Tobias Geerinckx-Rice <me@tobias.gr>

web: Remove the nginx-service procedure.

Now that the service-type has a default value, and configuration record is
accessible.

* gnu/services/web.scm (nginx-service): Remove procedure.
* doc/guix.texi (Web Services): Update and improve NGinx documentation.

web: Add default-value for the nginx-service-type.

* gnu/services/web.scm (nginx-service-type)[default-value]:
  Use (nginx-configuration).

web: Export more nginx related procedures, macros and record types.

This makes it possible to work with the configuration of the NGinx service
programatically.

* gnu/services/web.scm (<nginx-configuration>, <nginx-server-configuration>,
  <nginx-upstream-configuration>, <nginx-location-configuration>,
  <nginx-named-location-configuration>): Export NGinx related record
  types.
  (nginx-configuration-*, nginx-server-configuration-*,
  nginx-upstream-configuration-*, nginx-location-configuration-*,
  nginx-named-location-configuration-*): Export NGinx related record
  procedures.
  (nginx-configuration): Export NGinx related record macro.

gnu: r-minimal: Do not compress serialized files.

* gnu/packages/statistics.scm (r-minimal)[arguments]: Replace build phase
"patch-which" with "do-not-compress-serialized-files".
[propagated-inputs]: Move "which" from here...
[inputs]: ...to here.

Fixes <https://bugs.gnu.org/28157>.

gnu: Add rmath-standalone.

* gnu/packages/statistics.scm (rmath-standalone): New variable.

gnu: gst-plugins-bad: Build with wayland support.

* gnu/packages/gstreamer.scm (gst-plugins-bad)[inputs]: Add wayland.

gnu: libraw: Update to 0.18.2.

* gnu/packages/photo.scm (libraw): Update to 0.18.2.
[source, home-page]: Use https.

gnu: skalibs: Build reproducibly.

* gnu/packages/skarnet.scm (skalibs)[arguments]: Add #:phases.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu: libjpeg-turbo: Build reproducibly.

* gnu/packages/image.scm (libjpeg-turbo)[arguments]: Add #:configure-flags.

Co-authored-by: Z. Ren <zren@dlut.edu.cn>

gnu: python-netcdf4: Update to 1.2.9.

* gnu/packages/python.scm (python-netcdf4): Update to 1.2.9.

gnu: python-h5py: Update to 2.7.0.

* gnu/packages/python.scm (python-h5py): Update to 2.7.0.