meta-ingrasys: meta-zaius: Cleanup for Yocto override syntax change

Cleanup with
```
convert-overrides.py meta-ingrasys

git grep -l _zaius -- meta-ingrasys \
  | xargs sed -i 's/_zaius/:zaius/'
```

After cleanup
```
$ git grep "_[a-z0-9_/-]*[ :]" -- meta-ingrasys | grep '.bb'
meta-ingrasys/meta-zaius/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend:# compose_list is not defined immediately so don't use :=
```

Signed-off-by: Brandon Kim <brandonkim@google.com>
Change-Id: Ib2da97530167688313ac16aedd69168137788c86
diff --git a/meta-ingrasys/meta-zaius/conf/local.conf.sample b/meta-ingrasys/meta-zaius/conf/local.conf.sample
index 2d4aecd..31c3f91 100644
--- a/meta-ingrasys/meta-zaius/conf/local.conf.sample
+++ b/meta-ingrasys/meta-zaius/conf/local.conf.sample
@@ -1,11 +1,11 @@
 MACHINE ??= "zaius"
 DISTRO ?= "openbmc-openpower"
 PACKAGE_CLASSES ?= "package_rpm"
-SANITY_TESTED_DISTROS_append ?= " *"
-EXTRA_IMAGE_FEATURES = "debug-tweaks"
-USER_CLASSES ?= "buildstats image-prelink"
+SANITY_TESTED_DISTROS:append ?= " *"
+EXTRA_IMAGE_FEATURES ?= "debug-tweaks"
+USER_CLASSES ?= "buildstats"
 PATCHRESOLVE = "noop"
-BB_DISKMON_DIRS = "\
+BB_DISKMON_DIRS ??= "\
     STOPTASKS,${TMPDIR},1G,100K \
     STOPTASKS,${DL_DIR},1G,100K \
     STOPTASKS,${SSTATE_DIR},1G,100K \
@@ -14,4 +14,4 @@
     ABORT,${DL_DIR},100M,1K \
     ABORT,${SSTATE_DIR},100M,1K \
     ABORT,/tmp,10M,1K"
-CONF_VERSION = "1"
+CONF_VERSION = "2"