xenclient-oe : Clone openxt build metadata with all the other meta-layers.

bblayers.conf : Change path to xenclient-oe build metadata.
local.conf-dist : Add local.conf template from xenclient-oe.git.
do_build.sh : Remove git clone of xenclient-oe.git and use variables
  in local.settings file instead.
setup_build : Clone xenclient-oe.git and fixup pathto bitbake patches.

OXT-24

Signed-off-by: Philip Tricca <flihp@twobit.us>