Test script for openpty()

[Yhg1s]

BPO	400697
Nosy	@Yhg1s
Files	None: None

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields: ```python assignee = None closed_at = created_at = labels = [] title = 'Test script for openpty()' updated_at = user = 'https://github.com/Yhg1s' ``` bugs.python.org fields: ```python activity = actor = 'twouters' assignee = 'none' closed = True closed_date = None closer = None components = ['None'] creation = creator = 'twouters' dependencies = [] files = ['2507'] hgrepos = [] issue_num = 400697 keywords = ['patch'] message_count = 2.0 messages = ['32976', '32977'] nosy_count = 1.0 nosy_names = ['twouters'] pr_nums = [] priority = 'normal' resolution = None stage = None status = 'closed' superseder = None type = None url = 'https://bugs.python.org/issue400697' versions = [] ```

[Yhg1s]

[Yhg1s]

Test script for os.openpty() specifically. Put in a different test so that people can be informed that their os.openpty() is non-functional. (As opposed to not available.)

Note, too, that this test can use os.isatty() once it is added ;)