Fixes an issue reported by @bdraco with the P100 not working in the
latest branch:
`[Errno None] Can not write request body for HOST_REDACTED,
ClientOSError(None, 'Can not write request body for
URL_REDACTED'))`
Issue caused by the number of multi requests going above the default
batch of 5 and the P100 not being able to handle the second multi
request happening immediately as it closes the connection after each
query (See https://github.com/python-kasa/python-kasa/pull/690 for
similar issue). This introduces a small wait time on concurrent requests
once the device has raised a ClientOSError.
91de5e20ba