When enabled, failed messages are kept in memory queue and saved on
shutdown and loaded on startup. This prevents message loss of failed
messages.
The failed items are saved in a simple Linked List and automatically
being reprocessed on resume or doaction.
Load/Save logik implemented.
This should also remove the last possible message loss from issue:
https://github.com/rsyslog/rsyslog/issues/1052
Also fixed tryresume and doAction handling when action is
in suspend state.
Calling for Callbacks more often.
Adjusted kafka fail test settings.
diag.sh script detects of kafka server comes up proberly
Added liblz4 to dependencies for omkafka/imkafka needed
for static linking.
This addresses the omkafka queue problem from issue:
https://github.com/rsyslog/rsyslog/issues/1052
Yet it does not fully solve the message problem yet,
but I am working on this.
