trivial: Remove 'tools/releasenotes_tox.sh'

This is not needed since reno 2.1.0 (commit f8fc8f97) [1].

[1] https://github.com/openstack/reno/commit/f8fc8f97

Change-Id: I335bba8c8bf4f2d73aba32ae762607e67ee3814c
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>

tools/tox_releasenotes.sh

@@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-
-rm -rf releasenotes/build
-
-sphinx-build -a -E -W \
-    -d releasenotes/build/doctrees \
-    -b html \
-    releasenotes/source releasenotes/build/html
-BUILD_RESULT=$?
-
-UNCOMMITTED_NOTES=$(git status --porcelain | \
-    awk '$1 ~ "M|A|??" && $2 ~ /releasenotes\/notes/ {print $2}')
-
-if [ "${UNCOMMITTED_NOTES}" ]
-then
-    cat <<EOF
-
-REMINDER: The following changes to release notes have not been committed:
-
-${UNCOMMITTED_NOTES}
-
-While that may be intentional, keep in mind that release notes are built from
-committed changes, not the working directory.
-
-EOF
-fi
-
-exit ${BUILD_RESULT}

tox.ini

@@ -4,7 +4,6 @@ envlist = py35,py36,py27,pypy,pep8,docs
 
 [testenv]
 usedevelop = True
-whitelist_externals = bash
 install_command = pip install {opts} {packages}
 passenv = PBR_INTEGRATION PIPFLAGS PIPVERSION PBRVERSION REPODIR WHEELHOUSE PROJECTS OS_TEST_TIMEOUT OS_STDOUT_CAPTURE OS_STDERR_CAPTURE
 deps =
@@ -26,7 +25,9 @@ commands = python setup.py build_sphinx
 
 [testenv:releasenotes]
 basepython = python3
-commands = bash -c {toxinidir}/tools/tox_releasenotes.sh
+commands =
+  rm -rf releasenotes/build
+  sphinx-build -W -b html -d releasenotes/build/doctrees releasenotes/source releasenotes/build/html
 
 [testenv:cover]
 basepython = python3