DERBY-6623 DatabaseMetaDataTest fails intermittently

Backported cleanly from trunk as:

svn merge -c 1615821 https://svn.apache.org/repos/asf/db/derby/code/trunk

Another instance of the test neglecting to consider that the rows may
legimimately come back in another order. Switched to using
assertFullUnorderedResultSet instead of assertFullResultSet.



git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.11@1616520 13f79535-47bb-0310-9956-ffa450edef68