pgbench: Show better progress when loading tuples

Show target number of tuples and percentage in addition to current
number.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/4c60b80094009c6f8ed9ccee365e445f07e609ab

Modified Files
--------------
contrib/pgbench/pgbench.c |    4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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