The nondurable_purge_delay option was introduced in [1] to prevent the
reconstructor removing non-durable data files on handoffs that were
about to be made durable. The DiskFileManager commit_window option has
since been introduced [2] which specifies a similar time window during
which non-durable data files should not be removed. The commit_window
option can be re-used by the reconstructor, making the
nondurable_purge_delay option redundant.
The nondurable_purge_delay option has not been available in any tagged
release and is therefore removed with no backwards compatibility.
[1] Related-Change: I0d519ebaaade35249fb7b17bd5f419ffdaa616c0
[2] Related-Change: I5f3318a44af64b77a63713e6ff8d0fd3b6144f13
Change-Id: I1589a7517b7375fcc21472e2d514f26986bf5079
2696a79f09