[FIXED] Do not use sync.Once.Do() in connection's first request init #538
+108
−133
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Replaced the use of sync.Once.Do() with a subscribe() version that
does not grab the lock (and assume to be running under the conn
lock).
Fixed some tests to reduce risk of go routine hanging at the end
of some tests.
Close the connection's asyncCBHandler even when close() is not
pushing disconnect/close CB.
Resolves #537
Signed-off-by: Ivan Kozlovic ivan@synadia.com