Share conn object

[emmdim]

When proxy is started the connection object should be passed to it also.
Moreover, whenever a modification is performed to the conn object the object
should ovewritten in the proxy:
myproxy.conobj = conn

This way the proxy will be able to be kind of up-to-date with the of_01 module
though it is for future work to make it synchronized.
This kind of up to date enables the proxy to raise events that the of_01 module will
read and will use the conn object to inform the switch.