logilab-astng #77187 ancestor() only returns the first class when inheriting from two classes from the same module [validation pending]

for instance:

import module
class A(module.B, module.C)
   ...

in such case, the .ancestors() method of the astng representation for A will fail to infer C.

This is due to a bug in inference path management (ie infinite loop safety belt) on such example (both A and C are infered through the 'import module' statement).