TEIID-2716: Support INSERT/UPDATE/DELETE on Cassandra
1) Added code to support update operations on Cassendra translator
2) removed select * representation from SQL string, as this will generate results out of order than expected by the engine
3) Cassendra does not support criteria to pushed on non index columns, updated the metadata as such to non-searchable
4) added some exception handling, instead of bubling up
Merge pull request #143 from rareddy/TEIID-2716

TEIID-2716: Support INSERT/UPDATE/DELETE on Cassandra