pgsql: Add more chattiness in server shutdown.

Add more chattiness in server shutdown.

Early returns from the buildfarm show that there's a bit of a gap in the
logging I added in 3971f64843b02e4a: the portion of CreateCheckPoint()
after CheckPointGuts() can take a fair amount of time. Add a few more
log messages in that section of code. This too shall be reverted later.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/7351e18286ec83461b386e23328d65fd4a538bba

Modified Files
--------------
src/backend/access/transam/xlog.c | 16 ++++++++++++++++
src/backend/storage/smgr/md.c | 5 +++++
2 files changed, 21 insertions(+)

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