dev-manual, ref-manual: Removed VIRTUAL-RUNTIME note from most places.

Fixes [YOCTO #5159]

Edits to fix the occurrences of VIRTUAL-RUNTIME_initscripts = "".
I removed it from all places in the manuals except under
"Selecting an Initialization Manager".  Note that it still
needed removed from "Using Systemd for the Main Image and
Using SysVinit for the Rescue Image".

Also, in the "Using Systemd Exclusively" section I made some
edits as suggested by Paul Eggleton's review.

(From yocto-docs rev: 28b2e3eba3acff17f165899a7f4a65c98263e201)

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

documentation/dev-manual/dev-manual-common-tasks.xml

@@ -2097,12 +2097,7 @@
                         located in your
                         <link linkend='source-directory'>Source Directory</link>.
                         section for more information.
-                        <note>For Systemd-based images, include the following
+                        </para></listitem>
-                        in your <filename>local.conf</filename> file:
-                        <literallayout class='monospaced'>
-     VIRTUAL-RUNTIME_initscripts = ""
-                        </literallayout>
-                        </note></para></listitem>
                 </itemizedlist>
             </para>
         </section>
@@ -5361,14 +5356,6 @@
         <section id='using-systemd-exclusively'>
             <title>Using Systemd Exclusively</title>
 
-            <para>
-                Set this variable in your <filename>local.conf</filename>
-                file:
-                <literallayout class='monospaced'>
-     VIRTUAL-RUNTIME_initscripts = ""
-                </literallayout>
-            </para>
-
             <para>
                 Set the these variables in your distribution configuration
                 file as follows:
@@ -5385,6 +5372,14 @@
                 Doing so removes any redundant SysVinit scripts.
             </para>
 
+            <para>
+                To remove  initscripts from your image altogether,
+                set this variable also:
+                <literallayout class='monospaced'>
+     VIRTUAL-RUNTIME_initscripts = ""
+                </literallayout>
+            </para>
+
             <para>
                 For information on the backfill variable, see
                 <ulink url='&YOCTO_DOCS_REF_URL;#var-DISTRO_FEATURES_BACKFILL_CONSIDERED'><filename>DISTRO_FEATURES_BACKFILL_CONSIDERED</filename></ulink>.
@@ -5394,14 +5389,6 @@
         <section id='using-systemd-for-the-main-image-and-using-sysvinit-for-the-rescue-image'>
             <title>Using Systemd for the Main Image and Using SysVinit for the Rescue Image</title>
 
-            <para>
-                Set this variable in your <filename>local.conf</filename>
-                file:
-                <literallayout class='monospaced'>
-     VIRTUAL-RUNTIME_initscripts = ""
-                </literallayout>
-            </para>
-
             <para>
                 Set the these variables in your distribution configuration
                 file as follows:

documentation/ref-manual/ref-classes.xml

@@ -2896,14 +2896,6 @@
         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>"

documentation/ref-manual/ref-variables.xml

@@ -7364,14 +7364,6 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     You can disable the service by setting the variable 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>
             </glossdef>
         </glossentry>
 
@@ -7395,14 +7387,6 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                     or packages in which the build system can find the systemd
                     unit files.
                 </para>
-
-                <note>
-                    For Systemd-based images, include the following
-                    in your <filename>local.conf</filename> file:
-                    <literallayout class='monospaced'>
-     VIRTUAL-RUNTIME_initscripts = ""
-                    </literallayout>
-                </note>
             </glossdef>
         </glossentry>
 
@@ -7424,14 +7408,6 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
      SYSTEMD_SERVICE_${PN} = "connman.service"
                     </literallayout>
                 </para>
-
-                <note>
-                    For Systemd-based images, include the following
-                    in your <filename>local.conf</filename> file:
-                    <literallayout class='monospaced'>
-     VIRTUAL-RUNTIME_initscripts = ""
-                    </literallayout>
-                </note>
             </glossdef>
         </glossentry>