Add support for using local PowerPC VM image

Patch adds support for PowerPC Big-endian and Little-endian local
fedora VM images and using VM images with two partitions,  PReP
boot and root partition. Since PowerPC requires PReP boot
partition to be present.

Change-Id: Iba03226e187609df898732c13b1aa5f895b156e3
Closes-Bug: 1413487

elements/redhat-common/bin/extract-image

@@ -50,7 +50,7 @@ function extract_image() {
 
             qemu-img convert -f qcow2 -O raw $CACHED_IMAGE $WORKING/$RAW_FILE
 
-            ROOT_PARTITON=p1
+            ROOT_PARTITON=p$(sudo kpartx -l $WORKING/$RAW_FILE | awk "/loop[0-9]+p/"|wc -l)
 
             # kpartx fails if no /dev/loop* exists, "losetup -f" prints first unused
             # loop device and creates it if it doesn't exist

elements/rpm-distro/pre-install.d/01-override-yum-arch

@@ -9,6 +9,12 @@ if [ "i386" = "$ARCH" ]; then
 elif [ "amd64" = "$ARCH" ]; then
     basearch=x86_64
     arch=x86_64
+elif [[ "$ARCH" = "ppc64" ]]; then
+    basearch=ppc64
+    arch=ppc64
+elif [[ "$ARCH" = "ppc64el" ]]; then
+    basearch=ppc64el
+    arch=ppc64el
 else
     echo "********************"
     echo "Unknown arch '$ARCH'"