elasticsearch-curator: drop botocore workaround

Curator got requirements sorted out upstream and builds fine now without
hack.

This reverts curator part of https://review.opendev.org/c/openstack/kolla/+/755339/

Change-Id: Iabe5b9684a7bf0e39a7dca824e6705b5069560bf
(cherry picked from commit 7db2f10)

Author: hrw

docker/elasticsearch/elasticsearch-curator/Dockerfile.j2

@@ -30,9 +30,7 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
     'elasticsearch-curator'
 ] %}
 
-{# FIXME: Revert the boto installations once we figure this issue out #}
-RUN {{ macros.install_pip(['"boto3<1.16"', '"botocore<1.19"'], constraints=false) }} \
-    && {{ macros.install_pip(elasticsearch_curator_pip_packages | customizable("pip_packages"), constraints=false) }} \
+RUN {{ macros.install_pip(elasticsearch_curator_pip_packages | customizable("pip_packages"), constraints=false) }} \
     && mkdir -p /etc/elasticsearch-curator \
     && chown -R elasticsearch: /etc/elasticsearch-curator