[BUG] DN string like argument taken as invalid keyword argument

Description
Custom module create by customer expects 3 positional arguments, the second one is a Active Directory DN string, ex: "cn=Users,dc=cselab,dc=local"

This strign seems to be interpreted as a keyword argument by Salt client, throwing:
The following keyword arguments are not valid: CN=Users,DC=cselab,DC=local

Workaround is to escape the '=' signs using '='

Setup
A simple module to show received args is provided.

Steps to Reproduce the behavior
Observe the output execution failing when using "cn=Users,dc=cselab,dc=local" vs escaped "cn=Users,dc=cselab,dc=local"

`
$ salt win* saltutil.sync_modules
winad01:
- modules.dn_test

$ cat dn_test.py
def show_args(groupname,base_dn,description):
return "Group Name: {gname}, DN: {DN}, Desc: {desc}".format(gname = groupname, DN = base_dn, desc = description)

$ salt win* dn_test.show_args my_group3 "cn=Users,dc=cselab,dc=local" "This is my new group."
winad01:
ERROR executing 'dn_test.show_args': The following keyword arguments are not valid: cn=Users,dc=cselab,dc=local
ERROR: Minions returned with non-zero exit code

$ salt win* dn_test.show_args my_group3 "cn=Users,dc=cselab,dc=local" "This is my new group."
winad01:
Group Name: my_group3, DN: cn=Users,dc=cselab,dc=local, Desc: This is my new group.

`

Expected behavior
While the workaround escaping code is acceptable, would be nice to have some logic to avoid this failure and take this type of string as a valid argument

Screenshots
If applicable, add screenshots to help explain your problem.

Versions Report

salt --versions-report

Salt Version:
Salt: 3002.2

Dependency Versions:
cffi: 1.9.1
cherrypy: unknown
dateutil: Not Installed
docker-py: Not Installed
gitdb: Not Installed
gitpython: Not Installed
Jinja2: 2.11.1
libgit2: Not Installed
M2Crypto: 0.35.2
Mako: Not Installed
msgpack: 0.6.2
msgpack-pure: Not Installed
mysql-python: Not Installed
pycparser: 2.14
pycrypto: Not Installed
pycryptodome: 3.10.1
pygit2: Not Installed
Python: 3.6.8 (default, Aug 13 2020, 07:46:32)
python-gnupg: Not Installed
PyYAML: 3.13
PyZMQ: 17.0.0
smmap: Not Installed
timelib: Not Installed
Tornado: 4.5.3
ZMQ: 4.1.4

System Versions:
dist: rhel 7.9 Maipo
locale: UTF-8
machine: x86_64
release: 3.10.0-1160.15.2.el7.x86_64
system: Linux
version: Red Hat Enterprise Linux Server 7.9 Maipo

Windows MInion:
c:\salt\bin>salt-call test.versions
local:
Salt Version:
Salt: 3002.2

Dependency Versions:
          cffi: 1.12.2
      cherrypy: 17.4.1
      dateutil: 2.8.0
     docker-py: Not Installed
         gitdb: 2.0.5
     gitpython: Not Installed
        Jinja2: 2.10.1
       libgit2: Not Installed
      M2Crypto: Not Installed
          Mako: 1.0.7
       msgpack: 1.0.0
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: 2.19
      pycrypto: Not Installed
  pycryptodome: 3.9.8
        pygit2: Not Installed
        Python: 3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)]
  python-gnupg: 0.4.4
        PyYAML: 5.3.1
         PyZMQ: 18.0.1
         smmap: 2.0.5
       timelib: 0.2.4
       Tornado: 4.5.3
           ZMQ: 4.3.1

System Versions:
          dist:
        locale: cp1252
       machine: AMD64
       release: 2016Server
        system: Windows
       version: 2016Server 10.0.14393 SP0