pgsql: pg_upgrade: preserve freeze info for postgres/template1 dbs

pg_upgrade:  preserve freeze info for postgres/template1 dbs

pg_database.datfrozenxid and pg_database.datminmxid were not preserved
for the 'postgres' and 'template1' databases.  This could cause missing
clog file errors on access to user tables and indexes after upgrades in
these databases.

Backpatch through 9.0

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/e20523f8f7649f0cb971ef0e8f8d97af9aa55b54

Modified Files
--------------
src/bin/pg_dump/pg_dumpall.c |   20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)