nwfilter: use virFindFileInPath for needed CLI tools
I am getting rid of determining the path to necessary CLI tools at compile time. Instead, now the firewall driver has an initialization function that uses virFindFileInPath() to determine the path to necessary CLI tools and a shutdown function to free allocated memory. The rest of the patch mostly deals with availability of the CLI tools and to not call certain code blocks if a tool is not available and that strings now have to be built slightly differently.
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