in_systemd: skip last journald entry already processed (#383)
in_systemd: skip last journald entry already processed (#383)

When ``DB`` parameter is used to store the last cursor, each new start
process as the first entry the one pointed by the stored cursor.

This change checks for each entry if cursor is the same as the one
stored and skip if it is true.

Signed-off-by: Eduardo Silva <81f705dc2ce1a61a2621e0e4b442a9474e1d0c70@treasure-data.com>

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