added coverage cleanup in coverage report test
added coverage cleanup in coverage report test

rsim/ruby-plsql-spec,vonahnen/ruby-plsql-spec,rsim/ruby-plsql-spec,vonahnen/ruby-plsql-spec,rsim/ruby-plsql-spec,jgebal/ruby-plsql-spec,rsim/ruby-plsql-spec,vonahnen/ruby-plsql-spec,jgebal/ruby-plsql-spec,jgebal/ruby-plsql-spec,vonahnen/ruby-plsql-spec