Add check in ProcedureRunner that gracefully rejects all transactions that fail due to missing class error.

Added new environment variables called __VOLTDB_CLUSTER_HOSTID__ and __VOLTDB_TARGET_CLUSTER_HOSTID__ that can be assigned through LocalCluster and the environment variables passed to the constructor of LocalCluster. These environment variables allow you to explicitly identify a specific HostId that should behave differently or "*" for all hosts to behave identically.
Added new test case that attempts to upgrade a catalog on a running system. RegressionSuite has been enhanced to allow you to select a specific HostId to connect the client. This allows stored procedures to fail predictably either at catalog compilation or at catalog deployment.
Clean up some comments used for testing and add comments for clarity
ENG-6229 Created a benchmark test for Materialized Views

This benchmark compares the performance overhead for inserts and deletes in a table with materialized views and a table without materialized views.
ENG-6229 Modified code to exit with correct error code
Add support for temp table count star optimization
Get rid of the extra flag, use the subquery flag instead; Add test cases for temp table count query optimization;
Add sql optimization for group by partition column,get rid of reAggregation on coordinator
Fix the related tests
Renaming most of the variables with 'm_' prefix
ENG-6223 Changed the csvloader --blank field's default to null
ENG-6229 Fixed a number of issues with the test and added a group field for more test flexibility
Add more planner negative tests
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6297-groupby-pk-opt
ENG-6229 Fixed the schema to properly use the new group field
ENG-6223 Added a test to verify that blank entries do not generate an error by default
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6223
Use Paul's way to clean up the executor
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6359-temptable-count
Add support for delete as we go.