Issue #1859 - Part 4: Update mar file generation scripts for use of xz.

- Update packaging scripts to support both lzma and bzip2
- Update python script to support lzma
- Update test scripts to support lzma to be thorough

This all requires xz to be available in the path on the build system.

tools/update-packaging/test/catmanifest.sh

@@ -9,6 +9,6 @@ mkdir -p "$workdir"
 cp "$1" "$workdir"
 cd "$workdir"
 mar -x "$1"
-mv updatev2.manifest updatev2.manifest.bz2
-bzip2 -d updatev2.manifest.bz2
+mv updatev2.manifest updatev2.manifest.xz
+xz -d updatev2.manifest.xz
 cat updatev2.manifest