pgsql: Allow parallel copy/link in pg_upgrade

Allow parallel copy/link in pg_upgrade

This patch implements parallel copying/linking of files by tablespace
using the --jobs option in pg_upgrade.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/a89c46f9bc314ed549245d888da09b8c5cace104

Modified Files
--------------
contrib/pg_upgrade/check.c | 8 +-
contrib/pg_upgrade/info.c | 21 ++++--
contrib/pg_upgrade/parallel.c | 147 ++++++++++++++++++++++++++++++++++----
contrib/pg_upgrade/pg_upgrade.c | 2 +-
contrib/pg_upgrade/pg_upgrade.h | 28 +++++---
contrib/pg_upgrade/relfilenode.c | 100 +++++++++++++++++++-------
contrib/pg_upgrade/tablespace.c | 14 ++--
doc/src/sgml/pgupgrade.sgml | 9 ++-
8 files changed, 256 insertions(+), 73 deletions(-)

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