feat(curl): Complete IP addresses for --interface

Part of #1315

Author: yedayak

completions/curl

@@ -101,6 +101,7 @@ _comp_cmd_curl()
             ;;
         --interface)
             _comp_compgen_available_interfaces -a
+            _comp_compgen -a ip_addresses -a
             return
             ;;
         --help | -${noargopts}h)

test/t/test_curl.py

@@ -48,3 +48,8 @@ def test_help_all_option(self, completion):
         do not have that.
         """
         assert completion
+
+    @pytest.mark.complete("curl --interface :")
+    def test_interface_ipv6(self, completion):
+        # Complete ipv6 localhost
+        assert ":1" in completion