Improved test suite in --rt mode (supports attr_bool, attr_json, attr_string and field_string now)

git-svn-id: http://sphinxsearch.googlecode.com/svn/trunk@3885 8b96e2b9-35c5-2c16-bc47-5122d61876d4
merged rel21 branch (up to r3884) back into trunk

git-svn-id: http://sphinxsearch.googlecode.com/svn/trunk@3886 8b96e2b9-35c5-2c16-bc47-5122d61876d4