reshke

prefixed reference relation drop bug

1

``` spqr-console=> show reference_relations; table name | schema version | shards ------------+----------------+-------- zz | 1 | [] zzx | 1 | [] (2 rows) spqr-console=> drop reference relation zz; ERROR:...

spqr simply discard (throws away) connection, which left in unfinished transaction block. We can intead rollback this block and reuse connection, for what pool_rollback option in designed. However, it seems...