pgsql: Adjust COPY FREEZE error message to be more accurate and consist

Adjust COPY FREEZE error message to be more accurate and consistent.

Per suggestions from Noah and Tom.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e8ae01966115a35d3815e0445da5f78878f6dd14

Modified Files
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src/backend/commands/copy.c | 50 ++++++++++++++++-------------------
src/test/regress/expected/copy2.out | 6 ++--
2 files changed, 26 insertions(+), 30 deletions(-)

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