libkmod-module: probe: change insertion to cover more use cases

libkmod-module: probe: change insertion to cover more use cases

Split kmod_module_probe_insert_module() in 2:
	1) Get list of modules to be loaded
	2) Iterate the list, loading the module

With this in future we will be able to cover use cases of modprobe,
that has a logic a bit more complicated.

With this we also change the logic to detect dependency loops: instead
of checking the recursion every STEP times, we now keep a field in
kmod_module, marking it as visited. We simply ignore already visited
modules and thus we break loops.