e2e/testutils: fix incorrect use of PluginConfigInterface

This code was using the type incorrectly; current versions of the
API MarshalText ignore this mistake, but the moby/moby/api module
produces an error:

    === Failed
    === FAIL: e2e/global TestPromptExitCode/plugin_install (0.28s)
        cli_test.go:203: assertion failed: error is not nil: json: error calling MarshalText for type plugin.CapabilityID: capability "docker.dummy/1.0" cannot contain a dot

    === FAIL: e2e/global TestPromptExitCode/plugin_upgrade (0.26s)
        cli_test.go:203: assertion failed: error is not nil: json: error calling MarshalText for type plugin.CapabilityID: capability "docker.dummy/1.0" cannot contain a dot

Signed-off-by: Sebastiaan van Stijn <[email protected]>

Author: thaJeztah

e2e/testutils/plugins.go

@@ -32,7 +32,11 @@ func SetupPlugin(t *testing.T, ctx context.Context) *fs.Dir {
 		},
 		Interface: types.PluginConfigInterface{
 			Socket: "basic.sock",
-			Types:  []types.PluginInterfaceType{{Capability: "docker.dummy/1.0"}},
+			Types: []types.PluginInterfaceType{{
+				Capability: "dummy",
+				Prefix:     "docker",
+				Version:    "1.0",
+			}},
 		},
 		Entrypoint: []string{"/basic"},
 	}