Fix FileDescriptors release on file rotate [#2100] #2115
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As reported by @kpalumbokitu in #2100 the file descriptors for rotated logs were not released after rotation. This change is an copy of the code provided by @kpalumbokitu in #2100.
This code works for me and also solves the problem of winston writing to multiple logfiles at the same time as reported in #1972 and #1905.