Make sure our use of websockets package is forwards compatible

It seems that between version 8 and 10 of the websockets package, a
redesign of the modules hierarchy was performed.

In version 8, when importing "websockets", we would end up with
a lot of extra things imported in the websockets namespace. For
instance:
 * websockets.exceptions
 * websockets.server

These extra are no longer imported in recent versions. Therefore, we
have to be more explicit when importing features from the websockets
package.

Signed-off-by: Olivier Gayot <olivier.gayot@sigexec.com>

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