[multipathd] rename init_paths() to init_vecs()
[multipathd] rename init_paths() to init_vecs()

Resync with the function real action.
From Edward Goggin patch-chest.

vijaychauhan/multipath-tools,gebi/multipath-tools,grzn/multipath-tools-explained,grzn/multipath-tools-explained,unakatsuo/multipath-tools,vijaychauhan/multipath-tools,unakatsuo/multipath-tools,unakatsuo/multipath-tools