[yocto-autobuilder-helper][PATCH] meta-oe-mirror: select systemd through INIT_MANAGER

The current configuration appends systemd and usrmerge directly to
DISTRO_FEATURES. This leaves VIRTUAL-RUNTIME_init_manager set to
sysvinit while systemd is also present in DISTRO_FEATURES.
Init manager selection is expected to be done through INIT_MANAGER.

see https://git.openembedded.org/openembedded-core/commit/?id=0b4061c5d50261f826d0edb4b478d2d305274b7c

The current meta-oe-mirror configuration breaks the autobuilder with a
large number of "Nothing PROVIDES" warnings/errors, as seen in build 717:

see  https://autobuilder.yoctoproject.org/valkyrie/#/builders/82/builds/717

Signed-off-by: El Mehdi YOUNES <[email protected]>
---
 config.json | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/config.json b/config.json
index 3c067d2..beef339 100644
--- a/config.json
+++ b/config.json
@@ -1813,7 +1813,8 @@
             ],
             "extravars" : [
                 "LICENSE_FLAGS_ACCEPTED = 'commercial'",
-                "DISTRO_FEATURES:append = ' pam systemd usrmerge opencl'",
+                "INIT_MANAGER = 'systemd'",
+                "DISTRO_FEATURES:append = ' pam opencl'",
                 "FORTRAN:forcevariable = ',fortran'",
                 "RUNTIMETARGET:append:pn-gcc-runtime = ' libquadmath'"
             ],