[Cassandra] Add: schema browser support & explicit protocol version#1482

Merged

arikfr merged 4 commits intogetredash:masterfrom yershalom:master

Jan 3, 2017

+16-6

Commits on Dec 22, 2016

Added get tables query for cassandra and expilicit protocol version to 3 (Also working with cassandra version 2.1 and above)
syerushalmy
committed

Commits on Dec 23, 2016

Fixed get_tables for execute 1 query instead of N queries
syerushalmy
committed

Commits on Dec 31, 2016

[Cassandra]: Changed test qurey due to error with parsing uuid as a result
syerushalmy
committed

Commits on Jan 2, 2017

Fixed from BaseSQLQueryRunner to BaseQueryRunner and get_schema instead of _get_tables
syerushalmy
committed