LDAPc: Allow starting ldapc as service from specified message id
LDAPc: Allow starting ldapc as service from specified message id

 - We can now set $LAST_PROCESSED_ID in /etc/perun/perun-ldapc
   forcing LDAPc to start processing auditer log from specified
   message ID.
 - If not set we start normally form last message id in auditer
   consumer.

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