Fixed Issues in Apache ZooKeeper

Review the list of ZooKeeper issues that are resolved in Cloudera Runtime 7.2.6.

CDPD-15702: Zookeeper clients fail to connect to a secure ZooKeeper if TLS certificate contains SAN entries that are not of type DNS or IP.

ZKHostnameVerifier now does not reject valid certificates with subjectAltNames anymore. This issue is now resolved.