"salt-ssh --roster dir ..." ignores "roster_defaults" master configuration option

Description of Issue

salt-ssh ignores the master configuration option "roster_defaults" when using a directory roster (--roster dir).
When using a flat file roster (--roster flat) the master configuration option "roster_defaults" is working.

Setup

(Please provide relevant configs and/or SLS files (Be sure to remove sensitive info).)

Flat file roster:

[root@endeavourvm ~]# cat /etc/salt/roster
endeavourvm: 
  host: 192.168.122.193

Directory roster:

[root@endeavourvm ~]# cat /etc/salt/roster.d/endeavourvm 
host: 192.168.122.193

From master configuration file /etc/salt/master

roster_defaults:
  thin_dir: /tmp/salt-thin_dir

Steps to Reproduce Issue

Comment out any roster_defaults in /etc/salt/master

# roster_defaults:
#   thin_dir: /tmp/salt-thin_dir

Call salt-ssh with "--roster flat"

[root@endeavourvm ~]# salt-ssh --roster flat endeavourvm  config.option thin_dir
/usr/lib/python3.10/site-packages/_distutils_hack/__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
endeavourvm:
    /var/tmp/.root_d39a06_salt

Call salt-ssh with "--roster dir"

[root@endeavourvm ~]# salt-ssh --roster dir endeavourvm  config.option thin_dir
/usr/lib/python3.10/site-packages/_distutils_hack/__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
endeavourvm:
    /var/tmp/.root_d39a06_salt

Note that thin_dir has the default setting with roster_defaults commented out -> Ok

Comment in roster_defaults configuration in /etc/salt/master.
In this case I want to have "thin_dir: /tmp/salt-thin_dir" for all my minions

roster_defaults:
  thin_dir: /tmp/salt-thin_dir

Call salt-ssh with "--roster flat" again

[root@endeavourvm ~]# salt-ssh --roster flat endeavourvm  config.option thin_dir
/usr/lib/python3.10/site-packages/_distutils_hack/__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
endeavourvm:
    /tmp/salt-thin_dir

Note that thin_dir now reflects the setting from roster_defaults in /etc/salt/master

Call salt-ssh with "--roster dir" again

[root@endeavourvm ~]# salt-ssh --roster dir endeavourvm  config.option thin_dir
/usr/lib/python3.10/site-packages/_distutils_hack/__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
endeavourvm:
    /var/tmp/.root_d39a06_salt

Note that thin_dir still has the default setting and not the setting from roster_defaults in /etc/salt/master

Versions Report

[root@endeavourvm ~]# salt --versions-report
/usr/lib/python3.10/site-packages/_distutils_hack/__init__.py:33: UserWarning: Setuptools is replacing distutils.
  warnings.warn("Setuptools is replacing distutils.")
Salt Version:
          Salt: 3005.1
 
Dependency Versions:
          cffi: 1.15.1
      cherrypy: Not Installed
      dateutil: Not Installed
     docker-py: Not Installed
         gitdb: Not Installed
     gitpython: Not Installed
        Jinja2: 3.1.2
       libgit2: Not Installed
      M2Crypto: 0.38.0
          Mako: Not Installed
       msgpack: 1.0.4
  msgpack-pure: Not Installed
  mysql-python: Not Installed
     pycparser: 2.21
      pycrypto: Not Installed
  pycryptodome: 3.12.0
        pygit2: Not Installed
        Python: 3.10.8 (main, Oct 13 2022, 21:13:48) [GCC 12.2.0]
  python-gnupg: Not Installed
        PyYAML: 6.0
         PyZMQ: 24.0.1
         smmap: Not Installed
       timelib: Not Installed
       Tornado: 4.5.3
           ZMQ: 4.3.4
 
System Versions:
          dist: endeavouros rolling rolling
        locale: utf-8
       machine: x86_64
       release: 6.0.6-arch1-1
        system: Linux
       version: EndeavourOS rolling rolling

Start with the salt-ssh entry point and reproduce the difference between --roster flat and --roster dir using the roster_defaults and thin_dir configuration shown here. Compare how both roster modes load these settings, then add regression coverage showing that a directory roster uses /tmp/salt-thin_dir when configured and retains the default when it is absent.