HCL generation problems

[xescugc]

The HCL generation still has some errors and sometimes fails or produces wrong outputs (not right directions or nodes).

We do not have such issue on TFState (we use to but was fixed) but on HCL we have it.

We have to find why is it failing, most probably related on how the HCL->graph.Graph before any operation is done to the graph as reading the HCL it's not as easy as TFState(json).

This issues are "hard" to reproduce as they fail once in a while but not always, for example:

--- FAIL: TestFromHCL_FlexibleEngine (0.00s)
    --- FAIL: TestFromHCL_FlexibleEngine/SuccessSG (0.00s)
        helper_test.go:66: 
            	Error Trace:	helper_test.go:66
            	            				hcl_test.go:90
            	Error:      	Fail
            	Test:       	TestFromHCL_FlexibleEngine/SuccessSG
            	Messages:   	The Edge with Source "flexibleengine_compute_instance_v2.instance_two" and Target "flexibleengine_compute_instance_v2.instance_one" is present but in the other direction
FAIL