meta-ibm: use ibm-ac-server MACHINEOVERRIDE

Use an override in bbappends in meta-witherspoon as described and
recommended in the "following best practices when creating layers"
section of the the Yocto development tasks manual.

ibm-ac-server represents common machine configuration shared by all of
IBMs "Accelerated Compute" class of servers.  Apply it wherever any
variables are un-bounded by any override.

This enables more flexible use of meta-witherspoon in build
configurations, and easy addition of machines to the layer.

(From meta-ibm rev: bb0e1d0699a4b9905c053c94af7d882cd71779fc)

Change-Id: I82f7338b0d7a64b5e7a67e19bcdff07f48a332d4
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-ibm/meta-witherspoon/recipes-core/systemd/systemd_%.bbappend b/meta-ibm/meta-witherspoon/recipes-core/systemd/systemd_%.bbappend
index 62ea76f..a40f618 100644
--- a/meta-ibm/meta-witherspoon/recipes-core/systemd/systemd_%.bbappend
+++ b/meta-ibm/meta-witherspoon/recipes-core/systemd/systemd_%.bbappend
@@ -1,13 +1,13 @@
 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
-SRC_URI += "file://journald-storage-policy.conf"
-SRC_URI += "file://systemd-journald-override.conf"
-SRC_URI += "file://journald-size-policy.conf"
+SRC_URI_append_ibm-ac-server = " file://journald-storage-policy.conf"
+SRC_URI_append_ibm-ac-server = " file://systemd-journald-override.conf"
+SRC_URI_append_ibm-ac-server = " file://journald-size-policy.conf"
 
-FILES_${PN} += "${systemd_unitdir}/journald.conf.d/journald-storage-policy.conf"
-FILES_${PN} += "${systemd_system_unitdir}/systemd-journald.service.d/systemd-journald-override.conf"
-FILES_${PN} += "${systemd_unitdir}/journald.conf.d/journald-size-policy.conf"
+FILES_${PN}_append_ibm-ac-server = " ${systemd_unitdir}/journald.conf.d/journald-storage-policy.conf"
+FILES_${PN}_append_ibm-ac-server = " ${systemd_system_unitdir}/systemd-journald.service.d/systemd-journald-override.conf"
+FILES_${PN}_append_ibm-ac-server = " ${systemd_unitdir}/journald.conf.d/journald-size-policy.conf"
 
-do_install_append() {
+do_install_append_ibm-ac-server() {
         install -m 644 -D ${WORKDIR}/journald-storage-policy.conf ${D}${systemd_unitdir}/journald.conf.d/journald-storage-policy.conf
         install -m 644 -D ${WORKDIR}/systemd-journald-override.conf ${D}${systemd_system_unitdir}/systemd-journald.service.d/systemd-journald-override.conf
         install -m 644 -D ${WORKDIR}/journald-size-policy.conf ${D}${systemd_unitdir}/journald.conf.d/journald-size-policy.conf