Move to Optiq 0.6
Also includes:
-improve exception catching
-move schema path parsing to Antlr
-close zookeeper connection on if client created
-enhance BaseTestQuery and have other query tests utilize it
-Various test fixes for better memory release. still needs client allocator to be closed.
-refactor DrillSqlWorker and create multiple SqlHandlers
-Add PojoRecordReader and DirectPlan capabilities
-Update Antlr to use same quoting rules as SQL: single quote for quoted strings, back ticks for identifiers
-Move back to old Sorts until bugs are fixed
-Refector SelectionVector management within Prels
-Add support for NO_EXCHANGES option
-Extract SchemaFactories to use Optiq's new Schema handling capabilities
-Add basic handling of cancel in UserServer
-Remove output requirement from Project
-Add start of usercredentials to User communication
