Create/alter/describe tables with complex types.

This patch adds parsing of complex types and tests for using complex
types in various exprs and create/alter/describe stmts.

Change-Id: Ibc211a560c889f5ccfb616813700b923c89d8245
Reviewed-on: http://gerrit.ent.cloudera.com:8080/3577
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: jenkins