(FACT-3446) Call close(2) with Solaris FFI

Previously, when Facter ran on Solaris it would use shutdown(2) to
attempt to close open sockets. However, this would leak file descriptors
and occasionally cause an issue where the system would hit its maximum
open files.

This commit updates Facter to instead use close(2) on Solaris to ensure
that file descriptors are not leaked.

lib/facter/resolvers/solaris/ffi/functions.rb

@@ -10,15 +10,15 @@ module Ioctl
 
           attach_function :ioctl_base, :ioctl, %i[int int pointer], :int
           attach_function :open_socket, :socket, %i[int int int], :int
-          attach_function :close_socket, :shutdown, %i[int int], :int
+          attach_function :close_socket, :close, %i[int], :int
           attach_function :inet_ntop, %i[int pointer pointer uint], :string
 
           def self.ioctl(call_const, pointer, address_family = AF_INET)
             fd = Ioctl.open_socket(address_family, SOCK_DGRAM, 0)
             begin
               ioctl_base(fd, call_const, pointer)
             ensure
-              Ioctl.close_socket(fd, 2)
+              Ioctl.close_socket(fd)
             end
           end
         end