pgsql: Split initdb.c main() code into multiple functions, for easier

Split initdb.c main() code into multiple functions, for easier
maintenance.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/b86327c1c53aab732e21666e8c8a97b11cded804

Modified Files
--------------
src/bin/initdb/initdb.c | 668 ++++++++++++++++++++++++++---------------------
1 files changed, 366 insertions(+), 302 deletions(-)

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