Ian Barwick ad24b04c35 Refactor pg_control parsing ...

The "data_checksum_version" field towards the end of the ControlFileData struct,
meaning its position varies between versions. Previously this wasn't a problem
as it was only required for operations involving 9.5 and later, and its position
within the control file has not changed between the current release and current
HEAD.

However, in order to support pg_rewind in 9.3 and 9.4, which both have changes in
the control file format, we'll need version-specific parsing. This will also make
it easier to deal with any future changes to the control file format.

2018-04-02 20:54:42 +09:00

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