Kubernetes logs stop processing after log rotation

[sciyoshi]

Docker's json-file logging driver tends to reuse inodes after rotating logs. This breaks the Kubernetes source, since it hardcodes the device/inode fingerprinting strategy and will use an old offset if it exists.

Related to #1779 and #1427, but this is currently making the source unusable in Kubernetes.

See discussion here: https://gitter.im/timberio-vector/community?at=5e541b86101adb4160c3e90e