Remove git hook for pre-push as it is redundant and causes issues when merging to mainline

patch by David Capwell; reviewed by Caleb Rackliffe for CASSANDRA-18309

.build/git/git-hooks/pre-push/100-push-submodules.sh

@@ -1,51 +0,0 @@
-#!/usr/bin/env bash
-# Licensed to the Apache Software Foundation (ASF) under one
-# or more contributor license agreements.  See the NOTICE file
-# distributed with this work for additional information
-# regarding copyright ownership.  The ASF licenses this file
-# to you under the Apache License, Version 2.0 (the
-# "License"); you may not use this file except in compliance
-# with the License.  You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Redirect output to stderr.
-exec 1>&2
-
-#set -o xtrace
-set -o errexit
-set -o pipefail
-set -o nounset
-
-bin="$(cd "$(dirname "$0")" > /dev/null; pwd)"
-
-_main() {
-  # In case the usage happens at a different layer, make sure to cd to the toplevel
-  local root_dir
-  root_dir="$(git rev-parse --show-toplevel)"
-  cd "$root_dir"
-
-  if [[ ! -e .gitmodules ]]; then
-    # nothing to see here, look away!
-    return 0
-  fi
-
-  local -r cmd='
-branch="$(git rev-parse --abbrev-ref HEAD)"
-[[ "$branch" == "HEAD" ]] && exit 0
-
-default_remote="$(git config --local --get branch."${branch}".remote || true)"
-remote="${default_remote:-origin}"
-
-git push --atomic "$remote" "$branch"
-'
-  git submodule foreach --recursive "$cmd"
-}
-
-_main "$@"

.build/git/install-git-defaults.sh

@@ -89,7 +89,6 @@ _install_hooks() {
   install_hook "$git_dir" "post-checkout" true
   install_hook "$git_dir" "post-switch"   false
   install_hook "$git_dir" "pre-commit"    false
-  install_hook "$git_dir" "pre-push"      false
 }
 
 _git_config_set() {