tools/tests/regression/: Fix some paths and scripts.

o scripts and Makefile are mostly location independent now
  (exception XEN_ROOT in Makefile)
o use of $() instead of ${} in Makefile

From: Andreas Florath <xen@flonatel.org>
Signed-off-by: Keir Fraser <Keir.Fraser@eu.citrix.com>

tools/tests/regression/scripts/build_python.sh

@@ -6,19 +6,19 @@
 
 set -e
 
-XEN_ROOT=$1
+REG_TEST_DIR=$1
 DEST=$2
 PKG_VERS=$3
 
 SUB_MAKES_MINUS_J=-j4
 
-BUILD_DIR=${XEN_ROOT}/tests/build
+BUILD_DIR=${REG_TEST_DIR}/build
 
 mkdir -p ${BUILD_DIR}
-(cd ${BUILD_DIR} && tar -xf ${XEN_ROOT}/tests/downloads/Python-$PKG_VERS.tgz)
+(cd ${BUILD_DIR} && tar -xf ${REG_TEST_DIR}/downloads/Python-$PKG_VERS.tgz)
 (cd ${BUILD_DIR}/Python-$PKG_VERS &&
  ./configure --enable-shared --enable-ipv6 --without-cxx \
-       --with-threads --prefix=${XEN_ROOT}/tests/installed/python-$DEST &&
+       --with-threads --prefix=${REG_TEST_DIR}/installed/python-$DEST &&
 make ${SUB_MAKES_MINUS_J} &&
 make install)
 rm -fr ${BUILD_DIR}/Python-$PKG_VERS