Add ppc64le architecture

This commit adds PowerPC64 Little Endian atchitecture

Signed-off-by: Dinar Valeev <dvaleev@suse.com>
parse sourcemedium/debugmedium for kiwi product builds
Set correct source place for .ovf file.
Optionally export .tar, it can be used for kiwi_post_run hook for storing additional data like SOURCES.