Re: binary version of pg_current_wal_insert_lsn and pg_walfile_name functions

[Ashutosh Sharma]

PFA v2 patch.

Changes in the v2 patch:

- Reuse the existing get_controlfile function in
src/common/controldata_utils.c instead of adding a new one.

- Set env variable PGDATA with the data directory specified by the user.

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With Regards,
Ashutosh Sharma.