Only accept binary name not path

I think we've discussed this a couple of times, although I can't now
find a link.

There's really no reason to specify a path, it's complicated to
describe, and it might open up weird path traversal attacks,so
disallow it.

Rename setPayloadBinaryPath to setPayloadBinaryName to reflect this
(and rename lots of other things to match). Add a check that it isn't
a path, and a test for that (and fix some other tests that were
breaking the new rule).

Also expand on the Javadoc around ABI & 32/64-bit.

Also add a check inside VS (because checks in the payload code can be
bypassed), and a host test for that.

Note that a VM created with a config file can still specify a path
inside the config file; CompOS relies on that to run code from its
APEX.

Bug: 261037705
Test: atest MicrodroidTests MicrodroidHostTests
Change-Id: Ie59b9c81d13a7a3e4ec62cf874d43bfaf6163431
diff --git a/vm/src/main.rs b/vm/src/main.rs
index 002e505..9fa805e 100644
--- a/vm/src/main.rs
+++ b/vm/src/main.rs
@@ -51,9 +51,10 @@
         #[clap(long)]
         config_path: Option<String>,
 
-        /// Path to VM payload binary within APK (e.g. MicrodroidTestNativeLib.so)
+        /// Name of VM payload binary within APK (e.g. MicrodroidTestNativeLib.so)
         #[clap(long)]
-        payload_path: Option<String>,
+        #[clap(alias = "payload_path")]
+        payload_binary_name: Option<String>,
 
         /// Name of VM
         #[clap(long)]
@@ -258,7 +259,7 @@
             storage,
             storage_size,
             config_path,
-            payload_path,
+            payload_binary_name,
             daemonize,
             console,
             log,
@@ -277,7 +278,7 @@
             storage.as_deref(),
             storage_size,
             config_path,
-            payload_path,
+            payload_binary_name,
             daemonize,
             console.as_deref(),
             log.as_deref(),