Add support for --extension --upgrade in run_test.pl

git-svn-id: http://svn.osgeo.org/postgis/trunk@12257 b70326c6-7e19-0410-871a-916f4a2858ee
Do not force extension-specific removal of objects on upgrade

It should be taken care of by the upgrade scripts themselves

git-svn-id: http://svn.osgeo.org/postgis/trunk@12259 b70326c6-7e19-0410-871a-916f4a2858ee