python-tornado: Update to version 2.3
This update includes several security fixes added in version 2.2.1 and 2.3
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Submitted by
Sascha Peilicke (saschpe)
Fixed bugs
bnc#765475
VUL-1: python-tornado: Tornado v2.2.1 tornado.web.RequestHandler.set_header() fix to prevent header injection
