cleanup: create postinstall script for cleanup package for live with installer

features.in/cleanup/live/image-scripts.d/90-cleanup-live-install-pkgs

+#!/bin/sh -efu
+### create a postinstall script to drop temporarily needed packages
+
+if [ -n "$GLOBAL_VERBOSE" ]; then
+	echo "** GLOBAL_CLEANUP_PACKAGES: $GLOBAL_CLEANUP_PACKAGES"
+	echo "** GLOBAL_CLEANUP_BASE_PACKAGES: $GLOBAL_CLEANUP_BASE_PACKAGES"
+fi >&2
+
+[ -n "$GLOBAL_CLEANUP_PACKAGES" ] ||
+	[ -n "$GLOBAL_CLEANUP_BASE_PACKAGES" ] || exit 0
+
+[ -x /usr/sbin/install2-init ] || exit 0
+
+CLEANUP_PACKAGES="$GLOBAL_CLEANUP_PACKAGES $GLOBAL_CLEANUP_BASE_PACKAGES"
+
+SCRIPT="/usr/share/install2/postinstall.d/01-remove-pkgs"
+
+cat > "$SCRIPT" << EOF
+#!/bin/sh -efu
+
+. install2-init-functions
+
+# don't override the script start message on the same line
+echo "removing $CLEANUP_PACKAGES"
+
+# remove temporary packages from the installed system
+list="\$(exec_chroot rpmquery -a --qf='%{NAME}\\n' $CLEANUP_PACKAGES)"
+[ -z "\$list" ] || exec_chroot apt-get remove -f -y  -- \$list
+EOF
+chmod +x "$SCRIPT"