More sensible client default timeout values

I guess the goal is to have operations allow enough time to recover from major failures.

While this may make sense for large jobs, it's a PITA for OLTP scenarios and could probably benefit from a faster failure mode in default

hbase.rpc.timeout = 60000

hbase.client.operation.timeout = 1200000

hbase.client.meta.operation.timeout = 1200000

The client meta ops timeout is not in defaults-xml and not documented in the book either.

https://hbase.apache.org/book.html#config_timeouts

Would it make sense to have aggressive defaults instead?