pgsql: Add new "-q" logging option (quiet mode) while in initialize mod

Add new "-q" logging option (quiet mode) while in initialize mode
(-i), producing only one progress message per 5 seconds along with
elapsed time and estimated remaining time. Also add elapsed time and
estimated remaining time to the default logging(prints one message
each 100000 rows).
Patch contributed by Tomas Vondra, reviewed by Jeevan Chalke and
Tatsuo Ishii.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/cf03ff6c4e6f3e6627ddc1cc0986b940828bcf98

Modified Files
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contrib/pgbench/pgbench.c | 63 +++++++++++++++++++++++++++++++++++++++++---
doc/src/sgml/pgbench.sgml | 11 ++++++++
2 files changed, 69 insertions(+), 5 deletions(-)

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