Clean up unusued files and some other maintenance stuff.

Maintenance stuff includes:
- Merged in utils.sh into run_tests.sh
- Add in create_gf as a command for the usage output.
- Updated README.md with updated instructions.

Removed following files:
- Android.mk
- acloud.sh
- pip_requirements.txt
- regen_proto.sh
- setup.py
- utils.sh

Bug: 112157352
Test: ./run_tests.sh
m acloud && acloud
m acloud_test && acloud_test

Change-Id: I1478cbd2a5b96949b4438ea8bb0563df9475956a
diff --git a/public/acloud_main.py b/public/acloud_main.py
index feeaa3a..4b77466 100644
--- a/public/acloud_main.py
+++ b/public/acloud_main.py
@@ -105,7 +105,12 @@
         Parsed args.
     """
     usage = ",".join([
-        CMD_CREATE, CMD_CREATE_CUTTLEFISH, CMD_DELETE, CMD_CLEANUP, CMD_SSHKEY,
+        CMD_CLEANUP,
+        CMD_CREATE,
+        CMD_CREATE_CUTTLEFISH,
+        CMD_CREATE_GOLDFISH,
+        CMD_DELETE,
+        CMD_SSHKEY,
         setup_args.CMD_SETUP,
     ])
     parser = argparse.ArgumentParser(