(ITS#8404) Fix for an assertion failure when olcDbRewrite is modified on a meta or asyncmeta database

[nivanova@symas.com]

Full_Name: Nadezhda Ivanova
Version: 2.5
OS: Ubuntu 14.04
URL: ftp://ftp.openldap.org/incoming/nadezhda-ivanova-160414.patch
Submission from: (NULL) (78.83.54.234)


The problem was reproduced when attempting to modify the dynamic configuration
of meta and asyncmeta rewrite engine. On a meta database that has rewrite
enabled and some rewrite rules configured, execute ldapmodify with the following
LDIF:
dn: olcMetaSub={0}uri,olcDatabase={1}meta,cn=config
replace: olcDbRewrite
olcDbRewrite: rewriteEngine "off"