Add support for .first and .filter(q: "foo")

[dustineichler]

Refactoring and replace.

    addrs = NetworkInterface.addresses(value).values.flatten

    # Strip interface name from address (see getifaddrs(3))
    addrs = addrs.map { |x| x['addr'].split('%').first }.select do |addr|
      begin
        IPAddr.new(addr).ipv4? && !addr[/^127.*/]
      rescue IPAddr::InvalidAddressError
        false
      end
    end

    addrs.any? ? addrs.first : ''

and

  iface = NetworkInterface.interfaces.collect do |iface|
    ip_address = NetworkInterface.addresses(iface).values.flatten.collect{|x| x['addr']}.select do |addr|
      begin
        IPAddr.new(addr).ipv4? && !addr[/^127.*/]
      rescue IPAddr::InvalidAddressError => e
        false
      end
    end.first
    {name: iface, addr: ip_address}
  end.select {|ni| ni[:addr]}.first

References:

1. https://github.com/rapid7/metasploit-framework/blob/102db261026058d017e20b9a04399bdf1cb6d7b4/lib/msf/core/opt_address_local.rb#L21-L32

2. https://github.com/rapid7/metasploit-framework/blob/master/spec/lib/msf/core/opt_address_local_spec.rb#L7-L16