Remove unused file tools/cover.sh

After commit I6f845ab4ef1a1c91048666614799a03ab02ab765 , this file
is not used anymore.

Change-Id: I6c7d072cc5d5c922afbeba108ae2a4fce06b1f1d

tools/cover.sh

@@ -1,71 +0,0 @@
-#!/bin/bash
-#
-#    Licensed 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.
-
-ALLOWED_EXTRA_MISSING=0
-
-show_diff () {
-    head -1 $1
-    diff -U 0 $1 $2 | sed 1,2d
-}
-
-if ! git diff --exit-code || ! git diff --cached --exit-code
-then
-    echo "There are uncommitted changes!"
-    echo "Please clean git working directory and try again"
-    exit 1
-fi
-
-# Checkout master and save coverage report
-git checkout HEAD^
-
-base_op_count=`grep "op\." -R zun/db/sqlalchemy/alembic/versions/ | wc -l`
-baseline_report=$(mktemp -t zun_coverageXXXXXXX)
-find . -type f -name "*.pyc" -delete && python setup.py testr --coverage --testr-args="$*"
-coverage report > $baseline_report
-mv cover cover-master
-cat $baseline_report
-baseline_missing=$(awk 'END { print $3 }' $baseline_report)
-
-# Checkout back and save coverage report
-git checkout -
-
-current_op_count=`grep "op\." -R zun/db/sqlalchemy/alembic/versions/ | wc -l`
-current_report=$(mktemp -t zun_coverageXXXXXXX)
-find . -type f -name "*.pyc" -delete && python setup.py testr --coverage --testr-args="$*"
-coverage report > $current_report
-current_missing=$(awk 'END { print $3 }' $current_report)
-
-# Show coverage details
-allowed_missing=$((baseline_missing+ALLOWED_EXTRA_MISSING+current_op_count-base_op_count))
-
-echo "Allowed to introduce missing lines : ${ALLOWED_EXTRA_MISSING}"
-echo "Missing lines in master            : ${baseline_missing}"
-echo "Missing lines in proposed change   : ${current_missing}"
-
-if [ $allowed_missing -ge $current_missing ]; then
-    if [ $baseline_missing -lt $current_missing ]; then
-        show_diff $baseline_report $current_report
-        echo "We believe you can test your code with 100% coverage!"
-    else
-        echo "Thank you! You are awesome! Keep writing unit tests! :)"
-    fi
-    exit_code=0
-else
-    show_diff $baseline_report $current_report
-    echo "Please write more unit tests, we must maintain our test coverage :( "
-    exit_code=1
-fi
-
-rm $baseline_report $current_report
-exit $exit_code