Increase the helper VM's default RAM size to 512MB

The default Virtual RAM size for the helper VM used to be 256MB

snf-image-host/common.sh.in

@@ -452,7 +452,7 @@ fi
 : ${HELPER_SOFT_TIMEOUT:=120}
 : ${HELPER_HARD_TIMEOUT:=5}
 : ${HELPER_USER:="nobody"}
-: ${HELPER_MEMORY:="256"}
+: ${HELPER_MEMORY:="512"}
 : ${PITHOS_DB:="sqlite:////@localstatedir@/lib/pithos/backend.db"}
 : ${PITHOS_DATA:="@localstatedir@/lib/pithos/data/"}
 : ${PROGRESS_MONITOR:="@PROGRESS_MONITOR@"}

snf-image-host/defaults.in

@@ -39,7 +39,7 @@
 # HELPER_USER="nobody"
 
 # HELPER_MEMORY: Virtual RAM size in megabytes to be given to the helper VM.
-# HELPER_MEMORY="256"
+# HELPER_MEMORY="512"
 
 # MULTISTRAP_CONFIG: Configuration file to be used with multistrap to create
 # the rootfs of the helper image.