Ldap.managed plugin is unable to modify/replace cn=config olcSyncRepl Attribute

Description of Issue

The ldap.managed plugin is unable to modify the olcSyncRepl attribute when it already exists in the cn=config database. Note this error only occurs after the initial run as the plugin is attempting to update an existing attribute. I can also verify that the directive is set to 'replace'

Setup

 - 'olcDatabase={0}config,cn=config':
      - replace:
          olcSyncRepl
            - 'rid=001 provider=ldap://ldap_poc1.xxxx.xxxx binddn="cn=config" 
              bindmethod=simple credentials=x searchbase="cn=config" 
              type=refreshAndPersist retry="5 5 300 5" timeout=1'
            - 'rid=002 provider=ldap://ldap_poc2.xxxx.xxxxx binddn="cn=config" 
              bindmethod=simple credentials=x searchbase="cn=config" 
              type=refreshAndPersist retry="5 5 300 5" timeout=1'
            - 'rid=003 provider=ldap://ldap_poc3.xxx.xxxx binddn="cn=config" 
              bindmethod=simple credentials=x searchbase="cn=config" 
              type=refreshAndPersist retry="5 5 300 5" timeout=1'
          olcMirrorMode: 'TRUE

Steps to Reproduce Issue

Error occurs on the second pass, would be relevant to a update operation

[root@dev-master ~]# salt dev-minion-01 state.apply openldap
dev-minion-01:
----------
          ID: openldap_entries
    Function: ldap.managed
      Result: False
     Comment: failed to modify entry olcDatabase={0}config,cn=config(exception in ldap backend: TYPE_OR_VALUE_EXISTS({'info': 'modify/add: olcSyncrepl: value #0 already exists', 'desc': 'Type or value exists'},)), modify entry olcDatabase={2}hdb,cn=config(exception in ldap backend: TYPE_OR_VALUE_EXISTS({'info': 'modify/add: olcSyncrepl: value #0 already exists', 'desc': 'Type or value exists'},))
     Started: 21:31:00.411394
    Duration: 28.915 ms
     Changes:   

Versions Report

Salt Version:
Salt: 2019.2.0

Dependency Versions:
cffi: Not Installed
cherrypy: Not Installed
dateutil: Not Installed
docker-py: Not Installed
gitdb: Not Installed
gitpython: Not Installed
ioflo: Not Installed
Jinja2: 2.7.2
libgit2: Not Installed
libnacl: Not Installed
M2Crypto: Not Installed
Mako: Not Installed
msgpack-pure: Not Installed
msgpack-python: 0.5.6
mysql-python: Not Installed
pycparser: Not Installed
pycrypto: 2.6.1
pycryptodome: Not Installed
pygit2: Not Installed
Python: 2.7.5 (default, Oct 30 2018, 23:45:53)
python-gnupg: Not Installed
PyYAML: 3.11
PyZMQ: 15.3.0
RAET: Not Installed
smmap: Not Installed
timelib: Not Installed
Tornado: 4.2.1
ZMQ: 4.1.4

System Versions:
dist: centos 7.6.1810 Core
locale: UTF-8
machine: x86_64
release: 3.10.0-957.5.1.el7.x86_64
system: Linux
version: CentOS Linux 7.6.1810 Core

Start with the ldap.managed plugin and reproduce the issue by running salt dev-minion-01 state.apply openldap twice using the provided cn=config and olcSyncRepl setup. Trace the second-pass update for the replace directive; done means an existing olcSyncRepl attribute can be updated without the TYPE_OR_VALUE_EXISTS error.