Transport Key-Value pairs should be space separated
pt-spec says that the options should be space-separated:
188.8.131.52. Bridge torrc lines Bridge lines specify how Tor should connect to a bridge. The Bridge line format is: Bridge [<transport>] <address>:<port> [<id-fingerprint>] [<k>=<v>] [<k>=<v>] [<k>=<v>] The PT-specific parts of this format are the [transport] and [k=v] values. <transport> is the name of the PT that MUST be used when connecting to the bridge, and the <k>=<v> values are PT-specific parameters that MUST be passed to the PT when connecting to the bridge (this MAY include keys, passwords or other PT configuration options) as specified in [CLIENTPARAMS].
we comma-separate them:
args = ",".join(["%s=%s" % (k, v) for k, v in self.argdict.items()])