Undefined behaviour when c'tor of flux_connection throws

[philippkraft]

See https://stackoverflow.com/q/56750390/3032680 for the problem discussion

[philippkraft]

This bug exists forever since cmf is using smart pointers - 2010, perhaps? But it should be resolved now, to enable exceptions when creating connections.

[philippkraft]

This issue can only be resolved by a complete renovation of the ownership model of connections. Development happens in cmf2...connection_ownership_i71