dev-manual, ref-manual: Added notes for Systemd-based images.

Fixes [YOCTO #5159]

In the dev-manual, I located instances where a note about using
VIRTURAL-RUNTIME_initscripts = "" in the local.conf file would
be appropriate.  Three areas updated.

In the ref-manual, I located the note in the systemd.bbclass
section and the variable descriptions for SYSTEM_AUTO_ENABLE,
SYSTEM_PACKAGES, and SYSTEMD_SERVICE.

(From yocto-docs rev: 57b0acf2f3f8159b635b42dcffa129f7d945eb81)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 55ee43ce87..c86875ed84 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -2854,6 +2854,14 @@
         to "disable".
     </para>
 
+    <note>
+        For Systemd-based images, include the following
+        in your <filename>local.conf</filename> file:
+        <literallayout class='monospaced'>
+     VIRTUAL-RUNTIME_initscripts = ""
+        </literallayout>
+    </note>
+
     <para>
         For more information on <filename>systemd</filename>, see the
         "<ulink url='&YOCTO_DOCS_DEV_URL;#selecting-an-initialization-manager'>Selecting an Initialization Manager</ulink>"