(GH-130) Fix 'include' parameter for Postgresql 8.1

This removes the 'include' parameter for PostgreSQL 8.1 as it was failing on
Centos 5.

Also added Centos 5 system tests using our new Vagrant boxes.

Signed-off-by: Ken Barber <ken@bob.sh>
(GH-130) Amend system tests for Centos 5

Skip tests that don't apply to Centos 5, and make sure the parent directory
for tablespace correction has the correct SELinux settings for tablespace
management.

Signed-off-by: Ken Barber <ken@bob.sh>
Merge pull request #131 from kbarber/ticket/master/130-unsupported_include_directive_postgres_81

Ticket/master/130 unsupported include directive postgres 81