(ITS#8440) syncrepl improvements for delta-sync mmr

[quanah@openldap.org]

Full_Name: Quanah Gibson-Mount
Version: 2.4.44
OS: Linux 2.6
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (75.111.52.177)


Syncprov currently skips contextCSN updates to the main DB, but not the
accesslog DB in delta-syncrepl configurations.  Consumers correctly ignore this
traffic with "CSN too old" messages, but the syncprov code to ignore the updates
in the main db should be extended to cover the accesslog DB to cut out this
unnecessary traffic.