Fix#791 - Removed load database config options from the daemon. Created an API endpoint and updated test.
Fix#745 - Added definition of continuous queries to load database config.
Close#792
This commit fixes two bugs:
Don't try to parse "inf" retention policy when creating a shard
space. This caused a panic to be thrown when a shard space is created
with infinity. Fix#774
`getExpiredShards()` used shard duration to determine which shards are
expired but should be using shard retention duration instead. Close#769