[BUG] mac_service module crashes on macOS Big Sur

[weswhet]

Description
When trying to run any mac_service modules on macOS Big Sur Beta4 you get the following traceback.

  File "/opt/local/bin/salt-call", line 11, in <module>
    load_entry_point('salt==3001.1', 'console_scripts', 'salt-call')()
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/scripts.py", line 445, in salt_call
    client.run()
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/cli/call.py", line 58, in run
    caller.run()
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/cli/caller.py", line 121, in run
    ret = self.call()
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/cli/caller.py", line 229, in call
    self.opts, data, func, args, kwargs
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/executors/direct_call.py", line 12, in execute
    return func(*args, **kwargs)
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/modules/mac_service.py", line 505, in status
    _get_service(name)
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/modules/mac_service.py", line 126, in _get_service
    services = __utils__["mac_utils.available_services"]()
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/utils/mac_utils.py", line 487, in available_services
    return _available_services(refresh)
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/utils/mac_utils.py", line 456, in _available_services
    data = _read_plist_file(root, file_name)
  File "/opt/salt/lib/python3.7/site-packages/salt-3001.1-py3.7.egg/salt/utils/mac_utils.py", line 366, in _read_plist_file
    plist = plistlib.load(handle)
  File "/opt/salt/lib/python3.7/plistlib.py", line 950, in load
    return p.parse(fp)
  File "/opt/salt/lib/python3.7/plistlib.py", line 260, in parse
    self.parser.ParseFile(fileobj)
  File "/Users/saltadmin/dev/salt/pkg/osx/build/Python-3.7.4/Modules/pyexpat.c", line 471, in EndElement
  File "/opt/salt/lib/python3.7/plistlib.py", line 272, in handle_end_element
    handler()
  File "/opt/salt/lib/python3.7/plistlib.py", line 332, in end_integer
    self.add_object(int(self.get_data()))
ValueError: invalid literal for int() with base 10: '0x0100000c'

This is caused by a new service that has been added in Big Sur. /System/Library/LaunchAgents/com.apple.cvmsCompAgent3600_arm64.plist

it contains a new key value pair that causes the ValueError with plistlib.

	<key>BinaryOrderPreference</key>
	<array>
		<integer>0x0100000c</integer>
	</array>

Technically this violates the spec at http://www.apple.com/DTDs/PropertyList-1.0.dtd. But this feels like a "Do as I say not as I do" situation from our friends over at the Fruit Co.

I'll update the code to handle this issue.

Setup
macOS Big Sur Beta4 machine. (could be in earlier betas as well)

Steps to Reproduce the behavior
run sudo salt-call service.status com.saltstack.salt.minion