Upgrade to discovery-server 1.16
Fix client hang when the server goes away
Extract class CodeCacheGcTrigger
Fix logging for full code cache condition
Add missing license header
Verify JVM requirements
Use the swift-hive-metastore client with presto.

Make presto use the swift based Metastore client to access remote Hive metastores.
code review feedback
Use retrying swift-hive-metastore.
more code review feedback