Avoid hot standby cancels from VAC FREEZE

VACUUM FREEZE generated false cancelations of standby queries on an
otherwise idle master. Caused by an off-by-one error on cutoff_xid
which goes back to original commit.

Backpatch to all versions 9.0+

Analysis and report by Marco Nenciarini

Bug fix by Simon Riggs

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/9af67b667cca10b3f458548c90a75e4e45ced2b3

Modified Files
--------------
src/backend/access/heap/heapam.c |    8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)


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