Combine parted script into one command

It looks like we may be encountering issues running the second or
third of these commands; combine them into one to reduce system
raciness.

Change-Id: Iacb93868c678161d84bb5c06a8180b8eb12b5fe7

playbooks/roles/fix_disk_layout/tasks/main.yaml

@@ -38,9 +38,10 @@
                 echo "*** ${DEV} unmounting and reformating"
                 umount ${DEV}
             fi
-            parted ${DEV} --script -- mklabel msdos
-            parted ${DEV} --script -- mkpart primary linux-swap 1 ${SWAPSIZE}
-            parted ${DEV} --script -- mkpart primary ext2 8192 -1
+            parted ${DEV} --script -- \
+                mklabel msdos \
+                mkpart primary linux-swap 1 ${SWAPSIZE} \
+                mkpart primary ext2 8192 -1
             sync
             # We are only interested in scanning $DEV, not all block devices
             sudo partprobe ${DEV}