* Extract systemvm.iso using bsdtar if available.
Signed-off-by: Kai Takahashi <k-takahashi@creationline.com>
* New dependency for CentOS 7 and Debian: bsdtar
bsdtar can extract iso images without mounting.
Signed-off-by: Kai Takahashi <k-takahashi@creationline.com>
* Remove all 'mount' and 'umount' command call(s).
Signed-off-by: Kai Takahashi <k-takahashi@creationline.com>