In case of corrupted log file (which has good chances to happen in case
of sudden unclean system shutdown), we set a flag which causes us to
checkpoint immediately, but never do anything else besides that. This
causes Filebeat to just checkpoint on each log operation (therefore
causing a high IO load on the server and also causing Filebeat to fall
behind).

This change resets the logInvalid flag after a successful checkpointing.

Co-authored-by: Tiago Queiroz <[email protected]>
(cherry picked from commit 217f5a6)

# Conflicts:
#	libbeat/statestore/backend/memlog/diskstore.go

Fix lint warning without changing behaviour, all errors that were not
handled are only logged.

This commit improves error reporting in Go integration tests, when a
module fails, its name and error are collected and printed at the end.

The deprecated `batch/v1beta1` is replaced by `batch/v1` in Kubernetes
manifests.