Change workspace cleanup to prebuild step

src/ci/env/build-info.txt

@@ -1 +0,0 @@
-CIBUILD=1

src/ci/scripts/prepareWorkspace.sh

@@ -20,30 +20,15 @@
 #  Author: Martin Stockhammer <martin_s@apache.org>
 #  Date:   2017-05-24
 #
-#  Clears the workspace, if the build number is higher
-#  for automatic workspace cleanup on the build slaves
-#
-#  To request a workspace cleanup increase the number for CIBUILD
-#  in the file ../env/build-info.txt and
+#  Removes directories that are not used anymore.
+##
+ATTIC_DIRS="redback-common/redback-common-jdo \
+ redback-rbac/redback-rbac-providers/redback-rbac-jdo \
+ redback-users/redback-users-providers/redback-users-jdo \
+ redback-keys/redback-keys-providers/redback-keys-jdo"
 
-## 
-BUILDINFO_DIR=${WORKSPACE}/ci
-BUILDINFO_FILE=${BUILDINFO_DIR}/buildinfo.sh
-REQ_BUILDINFO_FILE=$(dirname $0)/../env/build-info.txt
-git checkout ${REQ_BUILDINFO_FILE}
-if [ -f ${REQ_BUILDINFO_FILE} ]; then
-  . ${REQ_BUILDINFO_FILE}
-else
-  CIBUILD=0
-fi
-REQUESTED_BUILD=${CIBUILD}
-CIBUILD=0
-if [ -f ${BUILDINFO_FILE} ]; then
-  . ${BUILDINFO_FILE}
-fi
-if [ ${CIBUILD} -lt ${REQUESTED_BUILD} ]; then
-  echo "Clearing workspace"
-  rm -rf ${WORKSPACE}/*
-  mkdir -p ${BUILDINFO_DIR}
-  echo "CIBUILD=${REQUESTED_BUILD}" >${BUILDINFO_FILE}
-fi
+for i in ${ATTIC_DIRS}; do
+ if [ "X${i}" != "X" -a -d ${i} ]; then
+   rm -rf ${i}
+ fi
+done