[python] toggle for sasl layer in proton.reactor.Container

[Gordon Sim]

I am proposing a change to the way the SASL layer is controlled in the 
proton.reactor.Container utility for python. Specifically that SASL will 
be on by default, but can be turned off at the container- or connection- 
level via a simple boolean flag. I've called the flag 'sasl_layer' as 
the proton based JMS client has a similar toggle with that name.

If anyone has thoughts or objections, please feel free to air them.
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