logilab-common #6085650 stop using load_module_from_name for registry loading [validation pending]

this is useless vs __import__ and causes pb in some cases (eg not considering properly parent package's __path__).

prioritynormal
typebug
done in1.2.1
load left0.000
closed by#7ebacaa38380 [registry] Stop using load_module_from_name
patch[registry] Stop using load_module_from_name [applied]