REGTEST: exclude OSX and generic targets from abns_socket.vtc

This one relies on Linux's abstract namespace sockets which are not
available there. FreeBSD used to already be excluded.
diff --git a/reg-tests/seamless-reload/abns_socket.vtc b/reg-tests/seamless-reload/abns_socket.vtc
index e29312c..b1f1aa5 100644
--- a/reg-tests/seamless-reload/abns_socket.vtc
+++ b/reg-tests/seamless-reload/abns_socket.vtc
@@ -14,7 +14,7 @@
 # expose-fd is available starting at version 1.8
 #REQUIRE_VERSION=1.8
 # abns@ sockets are not available on freebsd
-#EXCLUDE_TARGETS=freebsd
+#EXCLUDE_TARGETS=freebsd,osx,generic
 #REGTEST_TYPE=bug
 
 haproxy h1 -W -conf {