cwclientlib #4571308 https does not use SNI [validation pending]

making cwclientlib crash with https://www.cubicweb.org

prioritynormal
typebug
done in0.2.1
load0.200
load left0.000
closed by#b2160394d7c8 [cwproxy] use pyopenssl for ssl support if available
patch[cwproxy] use pyopenssl for ssl support if available [applied]