skip tests failing on jruby

Author: p

spec/mongo/address/ipv6_spec.rb

@@ -89,6 +89,9 @@
 
   describe '#socket' do
 
+    # In JRuby 9.3.2.0 Socket::PF_INET6 is nil, causing IPv6 tests to fail.
+    fails_on_jruby
+
     let(:address) do
       '[::1]'
     end

spec/mongo/address_spec.rb

@@ -228,6 +228,9 @@
 
     context 'when providing a DNS entry that resolves to both IPv6 and IPv4' do
 
+      # In JRuby 9.3.2.0 Socket::PF_INET6 is nil, causing IPv6 tests to fail.
+      fails_on_jruby
+
       let(:custom_hostname) do
         'not_localhost'
       end