Abstract HBase specific options from Label meta table columns

Currently Label(meta) has hbase_table_name, hbase_ttl, compression_algorithm configuration value as column in Label table.
I think it is inevitable to store these configuration value, but current implementation is too hbase specific. for example, redis storage might not use hbase_table_name on label. I think it is better to store json dictionary containing configuration values as column on Label.

Little bit of background of this issue is following.
I was up to implement secure cluster support and realize it is hard to add extra configuration for HBase. I think Redis storage(S2GRAPH-1) has similar issues that it needs to store redis specific configuration per label.