pgsql: In pg_upgrade, limit schema name filter to include toast tables.

In pg_upgrade, limit schema name filter to include toast tables. Bug
introduced recently when trying to filter out temp tables.

Backpatch to 9.0 and 9.1.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/df957a79cc2600e9e172500939c82bcf100b4dfd

Modified Files
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contrib/pg_upgrade/info.c | 8 ++++--
contrib/pg_upgrade/version_old_8_3.c | 39 +++++++++++++++++++++------------
2 files changed, 30 insertions(+), 17 deletions(-)