Skip link-local addresses when fixing IPv6 route

This occurs with a Linux host when a link-local address is configured
for vboxnet0 (which is the default for VirtualBox 5.2.6).

`connect': Invalid argument - connect(2) for "fe80::ffff:ffff:ffff:ffff" port 80 (Errno::EINVAL)

plugins/providers/virtualbox/action/network_fix_ipv6.rb

@@ -43,6 +43,7 @@ module VagrantPlugins
           # If we have no IPv6, forget it
           return if !has_v6
 
+          link_local_range = IPAddr.new("fe80::/10")
           host_only_interfaces(env).each do |interface|
             next if !present?(interface[:ipv6])
             next if interface[:status] != "Up"
@@ -50,6 +51,8 @@ module VagrantPlugins
             ip = IPAddr.new(interface[:ipv6])
             ip |= ("1" * (128 - interface[:ipv6_prefix].to_i)).to_i(2)
 
+            next if link_local_range.include?(ip)
+
             @logger.info("testing IPv6: #{ip}")
 
             begin