[389-devel] Please review: [389 Project] #47606: replica init/bulk import errors should be more verbose

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https://fedorahosted.org/389/ticket/47606

https://fedorahosted.org/389/attachment/ticket/47606/0001-Ticket-47606-replica-init-bulk-import-errors-should-.patch

 Description:
 1. maxbersize: If the size of an entry is larger than the consumer's
    maxbersize, the following error used to be logged:
      Incoming BER Element was too long, max allowable is ### bytes.
      Change the nsslapd-maxbersize attribute in cn=config to increase.
    This message does not indicate how large the maxbersize needs to be.
    This patch adds the code to retrieve the failed ber size.
    Revised message:
      Incoming BER Element was @@@ bytes, max allowable is ### bytes.
      Change the nsslapd-maxbersize attribute in cn=config to increase.
    Note: There is no lber API that returns the ber size if it fails to
    handle the ber.  This patch borrows the internal structure of ber
    and get the size.  This could be risky since the size or structure
    of the ber could be updated in the openldap lber.
 2. cache size: The bulk import depends upon the nsslapd-cachememsize
    value in the backend instance entry (e.g., cn=userRoot,cn=ldbm
    database,cn=plugins,cn=config).  If an entry size is larger than
    the cachememsize, the bulk import used to fail with this message:
      import userRoot: REASON: entry too large (@@@ bytes) for the
      import buffer size (### bytes).  Try increasing nsslapd-
      cachememsize.
    Also, the message follows the skipping entry message:
      import userRoot: WARNING: skipping entry "<DN>"
    but actually, it did NOT "skip" the entry and continue the bulk
    import, but it failed there and completely wiped out the backend
    database.
    This patch modifies the message as follows:
      import userRoot: REASON: entry too large (@@@ bytes) for the
      effective import buffer size (### bytes). Try increasing nsslapd-
      cachememsize for the backend instance "userRoot".
    and as the message mentions, it just skips the failed entry and
    continues the bulk import.


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