res_http_websocket: websocket write timeout fails to fully disconnect

res_http_websocket: websocket write timeout fails to fully disconnect

When writing to a websocket if a timeout occurred the underlying socket did not
get closed/disconnected. This patch makes sure the websocket gets disconnected
on a write timeout. Also a notice is logged stating that the websocket was
disconnected.

ASTERISK-24701 #close
Reported by: Matt Jordan
Review: https://reviewboard.asterisk.org/r/4412/
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Merged revisions 431669 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 431670 from http://svn.asterisk.org/svn/asterisk/branches/13

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@431671 65c4cc65-6c06-0410-ace0-fbb531ad65f3