Fixing flaky crash after 17.5 merge

The 17.5 release includes a bugfix for the smgrcode: previously
if smgropen failed, smgrclose wasn't called.

In our case we tried to retrieve the key before calling mdopen in
smgropen, which meant that the open call failed before the data
initialization in mdopen, which sometimes caused mdclose to crash.

The fix is simple: as mdopen only zero initializes some data, we
call it before trying to retrieve the principal key. This way the
failure happens after every data structure is set up properly.

Pass proper old rlocator to smgr when creating relations and indexes (#…

…156)

Merge pull request #27 from dutow/pg1282

PG-1282: Fix `SELECT version()`

Updated pg_tde submodule reference

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