Rename ART run-tests `expected.txt` files as `expected-stdout.txt`.

This is in preparation for the addition of `expected-stderr.txt` files
in all ART run-test directories, which will record the expected
standard error for each of these tests, and which will be verified
along with `expected-stdout.txt`.

Test: Run ART run-tests on host and device using `testrunner.py`.
Test: atest --test-mapping art:all
Bug: 171865375
Bug: 147812905
Change-Id: I37e3c4b8409475790e2fc63514cdf57156d47ff4
diff --git a/test/1951-monitor-enter-no-suspend/Android.bp b/test/1951-monitor-enter-no-suspend/Android.bp
index a4b699c..00d271c 100644
--- a/test/1951-monitor-enter-no-suspend/Android.bp
+++ b/test/1951-monitor-enter-no-suspend/Android.bp
@@ -8,13 +8,13 @@
     defaults: ["art-run-test-defaults"],
     test_config_template: ":art-run-test-target-no-test-suite-tag-template",
     srcs: ["src/**/*.java"],
-    data: [":art-run-test-1951-monitor-enter-no-suspend-expected"],
+    data: [":art-run-test-1951-monitor-enter-no-suspend-expected-stdout"],
 }
 
 // Test's expected output.
 genrule {
-    name: "art-run-test-1951-monitor-enter-no-suspend-expected",
-    out: ["art-run-test-1951-monitor-enter-no-suspend-expected.txt"],
-    srcs: ["expected.txt"],
+    name: "art-run-test-1951-monitor-enter-no-suspend-expected-stdout",
+    out: ["art-run-test-1951-monitor-enter-no-suspend-expected-stdout.txt"],
+    srcs: ["expected-stdout.txt"],
     cmd: "cp -f $(in) $(out)",
 }