Resolves: bug 238762
    Bug Description: Support "auto" for "Import cache size" in the LDBM Plug-in Settings
    Reviewed by: nhosoi (Thanks!)
    Fix Description: Added a check box for "use auto cache size".  If this is checked, a value of -1 will be saved for nsslapd-import-cache-autosize which will tell the server to use the default auto cache value.  If this is not checked, a value of 0 will be saved which will tell the server to use the number from nsslapd-import-cachesize.  If the check box is checked, the import cachesize field will be disabled.  Here are a couple of screen shots.
    https://bugzilla.redhat.com/attachment.cgi?id=326699
    https://bugzilla.redhat.com/attachment.cgi?id=326700
    Platforms tested: RHEL5
    Flag Day: no
    Doc impact: yes - will have to document the new UI