Add more AO/CO test coverage which covers a fixed bug from v4.1.0.0. Also,
add some cardinality and domain tests on bitmap indexes and scans. Most of
these test additions are modified/inspired from Pivotal's internal testing.

Signed-off-by: NGeorge Caragea <gcaragea@pivotal.io>

Most of these test additions are inspired from Pivotal's internal
testing and needed to be added to the open source installcheck to
give the community more test coverage on AO/CO tables.  This commit
mostly adds extra coverage for indexes and partition tables.

Most of these test additions are inspired from Pivotal's internal
testing and needed to be added to the open source installcheck to
give the community more test coverage.

Incremental backup uses modcount to decide if AO/CO table needs to be
included for incremental backup. So, update or delete to AO/CO must
increment the modcount, this adds validation for the same to ICG instead
of having it in some other complicated test framework.

This change applies only to column oriented tables (CO).  It reads
block directory entries for only those columns that appear in project
list (e.g. select clause).

Closes #369