Re: [libvirt] [PATCH 1/4] conf: use typedefs for enums in "src/conf/{node_device_conf, nwfilter_params}.h"

In "src/conf/" there are many enumeration (enum) declarations. Similar to the recent cleanup to "src/util" directory, it's better to use a typedef for variable types, function types and other usages. Other enumeration and folders will be changed to typedef's in the future. Most of the files changed in this commit are reltaed to Network (node_device_conf.h and nwfilter_params.*) enums.