leapp/snactor/fixture.py is not compatible with py3

Line 56 in 430ac84

func.func_code = _patched_name(func.func_code, name)

E           AttributeError: 'function' object has no attribute 'func_code'

This makes any exception happened during the testing of actors unreadable

@zhukovgreen leapp and leapp-repository need to be compatible with both python (py2 and py3), on leapp-repository we use six.PY3 to check it, since six package is one of the requirements..

@fellipeh I tried to fix it with just func.__code__ , but then it stuck with another issue somewhere when initializing CodeType here:

leapp/leapp/snactor/fixture.py

Lines 20 to 34 in 430ac84

    
           return types.CodeType( 
        
               code.co_argcount, 
        
               code.co_nlocals, 
        
               code.co_stacksize, 
        
               code.co_flags, 
        
               code.co_code, 
        
               code.co_consts, 
        
               code.co_names, 
        
               code.co_varnames, 
        
               code.co_filename, 
        
               name, 
        
               code.co_firstlineno, 
        
               code.co_lnotab, 
        
               code.co_freevars, 
        
               code.co_cellvars,

so I gave up for a while, and decided to report:)

	return types.CodeType(
	code.co_argcount,
	code.co_nlocals,
	code.co_stacksize,
	code.co_flags,
	code.co_code,
	code.co_consts,
	code.co_names,
	code.co_varnames,
	code.co_filename,
	name,
	code.co_firstlineno,
	code.co_lnotab,
	code.co_freevars,
	code.co_cellvars,