io: cope with websock 'Connection' header having multiple values
The noVNC server sends a header "Connection: keep-alive, Upgrade" which fails our simple equality test. Split the header on ',', trim whitespace and then check for 'upgrade' token. Reviewed-by:Eric Blake <eblake@redhat.com> Signed-off-by:
Daniel P. Berrange <berrange@redhat.com>
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