remove(build_container): Kill catalyst-based container script

Never actually used this, new plan is slightly different.

build_container

@@ -1,41 +0,0 @@
-#!/bin/bash
-#
-# Copyright (c) 2013 The CoreOS Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
-. "${SCRIPT_ROOT}/common.sh" || exit 1
-
-TYPE="coreos-buildbot"
-FORCE_STAGES="stage4"
-
-. "${BUILD_LIBRARY_DIR}/catalyst.sh" || exit 1
-
-# include upload options
-. "${BUILD_LIBRARY_DIR}/release_util.sh" || exit 1
-
-## Define the stage4 config template
-catalyst_stage4() {
-cat <<EOF
-target: stage4
-pkgcache_path: $BINPKGS
-stage4/packages: coreos-devel/buildhost-depends
-stage4/fsscript: ${BUILD_LIBRARY_DIR}/catalyst_default_stage4.sh
-EOF
-catalyst_stage_default
-}
-
-catalyst_init "$@"
-check_gsutil_opts
-
-if [[ "$STAGES" =~ stage4 ]]; then
-    info "Setting release to ${COREOS_VERSION_STRING}"
-    rm -rf "${TEMPDIR}/stage4_overlay"
-    mkdir -p "${TEMPDIR}/stage4_overlay"
-    "${BUILD_LIBRARY_DIR}/set_lsb_release" \
-        --root "${TEMPDIR}/stage4_overlay"
-fi
-
-catalyst_build
-command_completed