pgsql: Fix pg_upgrade to properly upgrade a table that is stored in the

Fix pg_upgrade to properly upgrade a table that is stored in the cluster
default tablespace, but part of a database that is in a user-defined
tablespace.  Caused "file not found" error during upgrade.

Per bug report from Ants Aasma.

Backpatch to 9.1 and 9.0.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/38458e45736efeb0d82739305c77c529c9cf0e1e

Modified Files
--------------
contrib/pg_upgrade/info.c       |   15 ++++++++++-----
contrib/pg_upgrade/pg_upgrade.h |    3 ++-
2 files changed, 12 insertions(+), 6 deletions(-)