adt-installer: ensure directory exists before copying/removing

adt-installer: ensure directory exists before copying/removing

If the installation is done in a directory which already contains a
valid installation, opkg will not install anything and the moving the
contents of /install/dir/opt/poky/1.2 (for example) to /install/dir will
throw some errors. However, the install directory will not be affected.
This patch will ensure that the /install/dir/opt/poky/1.2 exists.

(From OE-Core rev: 1cd01533cbec0e9ed61bbd33ecdf5dc306a32eec)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>