pgsql: In initdb.c, rename some newly created functions, and move the d

In initdb.c, rename some newly created functions, and move the directory
creation and xlog symlink creation to separate functions.

Per suggestions from Andrew Dunstan.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/26374f2a0fc02b76a91b7565e908dbae99a3b5f9

Modified Files
--------------
src/bin/initdb/initdb.c | 66 +++++++++++++++++++++++++++++-----------------
1 files changed, 41 insertions(+), 25 deletions(-)

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