Add `vm` tool for talking to Virt Manager.

For now it just has a single command, to run a specified VM.

Bug: 181869875
Test: Started a VM on a VIM3L
Change-Id: Ifdaaccb3be92e774ee4d7672914a3014220af489
diff --git a/apex/Android.bp b/apex/Android.bp
index 0985577..50c17f6 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -29,6 +29,7 @@
     binaries: [
         "assemble_cvd",
         "virtmanager",
+        "vm",
     ],
     filesystems: ["microdroid"],
 }