More options and rename maps; one file per rust_test
* Add a --no-host option.
* Add a --host-first-multilib option.
* Add special renaming for protoc_gen_rust.
* Dump a rust_defaults module to be shared by rust_test modules.
* Every test source file is in a rust_test module.
* Add RENAME_DEFAULTS_MAP for altered rust_defaults names.
* Suppress old error message on --extern proc_macro.
Test: regenerate Android.bp files and check differences
Bug: 161090277
Bug: 161089524
Change-Id: I8c70f568facf58d282ea2a2e72b60c8a2972b27d
1 file changed