Revert "Upgrade guava to 23.6.1-jre"
Revert "Upgrade guava to 23.6.1-jre"

This reverts commit cc00358bc84234a8f50188d174021ffcca3126fd.

JIRA Issues: AITOOLS-5798

Differential Revision: https://phabricator.twitter.biz/D412828

twitter/util,twitter/util,twitter/util