Fixed Issues in Schema Registry

Review the list of Schema Registry issues that are resolved in Cloudera Runtime 7.2.7.

CDPD-18943: Remove HA tables from the database
Removed table "host_config" which was used for communication between hosts. Since the High-Availability feature was removed in Schema Registry 0.10.0, this table is not used anymore.
CDPD-17299: Schema Registry Client can not relogin with dynamic JAAS config
When the Schema Registry Client used dynamic JAAS, it could not renew the Kerberos ticket after it expired. This issue has been fixed.