pgsql: Tweak initdb to reduce verbosity of progress messages, by

Log Message:
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Tweak initdb to reduce verbosity of progress messages, by printing just
one 'creating subdirectories' message instead of one per subdirectory.
The original decision to print something for each subdirectory was made
when there were only one or two of 'em; we have way too many now.
Per discussion.

Modified Files:
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pgsql/src/bin/initdb:
initdb.c (r1.106 -> r1.107)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c.diff?r1=1.106&r2=1.107)