Use conventional args style for gen_jarjar

gen_jarjar supported multi-valued arguments via space-separated lists,
like "--apistubs foo bar". This is unusual, as "bar" would generally be
interpreted as a positional argument instead.

Change the usage to "--apistubs foo --apistubs bar", which is more
conventional. Also remove the "--jars" switch to have the jars be
positional arguments instead, and change the "--unsupportedapi"
arguments to be a column-separated list (like java classpath), instead
of space-separated. For --unsupportedapi, this allows providing a list
of files via minimal modifications in the genrule usage.

Test: m
Change-Id: Id67ad16de2ea6682fee402540f464ed3b5b0cca9

tools/testdata/java/android/net/IpSecTransform.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.net;
+
+/**
+ * Test class with a name matching a public API in a secondary (framework-connectivity-t) stubs jar.
+ */
+public class IpSecTransform {
+}