allowed_vlans on meraki_ms_switchport should be string not list

[craigers521]

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The default data type for the API parameter is a string, i believe this should also be true for the ansible module. It looks like you are taking a list of ints and converting them to a string anyway. I believe this is breaking idempotency, and in my case its also forcing me to use more complex logic when converting my host_vars from using the switchport module into creating a body for the action_batches payload. Also causing some weirdness when using a range of vlans.