[NSE] Verbosity/debugging info for scripts

Hey everyone!

As far as I know, there is no way for scripts to get Nmap's verbosity or
debugging values (o.verbose and o.debugging). I have attached a patch
to give this info to scripts and a test script to illustrate it's usage.

nmap.verbosity() gives you the o.verbose value and nmap.debugging()
gives you the o.debugging value.

Everything seems to work fine for me, all as expected.

Please give it a try, and let me now what you think! Any suggestions on
better names than "nmap.verbosity()" and "nmap.debugging()" are welcome,
but these just made the most sense to me.

Thanks,
Kris Katterjohn

id = "test"

author = "me"

description = "testing"

categories = {"safe"}

require "stdnse"

portrule = function(host, port)
        return true
end

action = function(host, port)
        local v = nmap.verbosity()
        local d = nmap.debugging()

        stdnse.print_debug("Verbosity: " .. v)
        stdnse.print_debug("Debugging: " .. d)

        if v > 1 then
                stdnse.print_debug("v > 1 works as expected")
        end

        if d > 5 then
                stdnse.print_debug("d > 5 works as expected")
        end

        return
end

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