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Fix polling observer issue with inode recycling #304

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Fix polling observer issue with inode recycling #304

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Commits on Mar 6, 2015

  1. Update dirsnapshot.py 

    Fix issue where one file was deleted and another file was created and the created file was assigned the inode of the deleted file.  This resulted in watchdog firing a moved event even though the files were totally unrelated.  Inodes can and will be recycled, it was happening frequently in our use case, depending solely on inode number to determine it is the same file won't work.  This change checks modification time before determining that the file with the given inode was moved instead of deleted/created.
    @jrichards99
    jrichards99 committed Mar 6, 2015
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  2. Fix tests. Since it is impossible to reliably detect file modifaction… 

    … then move vs file delete then create, this test case now tests for delete and create in this scenario. Also, not all versions of Linux have nanosecond resolution on stat m_time (CentOS 5.10 did not) so fix wait time that assumed this was the case.
    @jrichards99
    jrichards99 committed Mar 6, 2015
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