Log checkpoint request flags in checkpoint completion messages.

Checkpoint completion log messages include more detail than checkpoint
start messages, but previously omitted the checkpoint request flags,
which were only logged at checkpoint start. As a result, users had to
correlate completion messages with earlier start messages to see
the full context.

This commit includes the checkpoint request flags in the checkpoint
completion log message as well. This duplicates some information,
but makes the completion message self-contained and easier to interpret.

Author: Soumya S Murali <[email protected]>
Reviewed-by: Michael Banck <[email protected]>
Reviewed-by: Yuan Li <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: 
https://postgr.es/m/CAMtXxw9tPwV=nbv5s9gzxmskpekv5f9hrhsjz8__olsos5j...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5b93a5987bd704d2363295eee919eee45f84c286

Modified Files
--------------
src/backend/access/transam/xlog.c | 60 +++++++++++++++++++++++----------------
1 file changed, 35 insertions(+), 25 deletions(-)

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