sijie opened a new pull request #1127: BP-29 (task 1) : Introduce 
`metadataServiceUrl`
URL: https://github.com/apache/bookkeeper/pull/1127
 
 
   Descriptions of the changes in this PR:
   
   - introduce a new setting `metadataServiceUrl` for replacing implementation 
specific settings `zkServers` and `zkLedgersRootPath`.
   - introduce a metadata driver interface for managing all the metadata 
interface
   - introduce a metadata driver manager for resolving `metadataServiceUrl` and 
load specific metadata service url based on service scheme. This
     would replace configuring multiple different manager classes using one 
single `metadataServiceUrl`.
   
   Please NOTE: this change only introduce the new classes, but it doesn't 
change the client and bookie to use the new setting. It will be done in
   a subsequent change.
   
   Master Issue: #1123 
   
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