Add newline to each generated bash script in rbe_test.go.

"exec format error" showed up on Mac when running the rbe_test.go.
The generated bash scripts did not have a newline at the end of
the file.

Bug: b/162600461
Fixes: b/162600461

Test: "m blueprint_tools" on Android Mac builder.
Change-Id: I425fa5f428733b6569c3fcdaa312023f9761d020
diff --git a/ui/build/rbe_test.go b/ui/build/rbe_test.go
index 908fdf0..23a53b4 100644
--- a/ui/build/rbe_test.go
+++ b/ui/build/rbe_test.go
@@ -36,13 +36,13 @@
 		env: []string{
 			"NOSTART_RBE=true",
 		},
-	}, /*{
+	}, {
 		description: "rbe metrics generated",
 		env: []string{
 			"USE_RBE=true",
 		},
 		generated: true,
-	}*/}
+	}}
 
 	for _, tt := range tests {
 		t.Run(tt.description, func(t *testing.T) {
@@ -91,17 +91,17 @@
 		description:      "output_dir not defined",
 		bootstrapProgram: rbeBootstrapProgram,
 		expectedErr:      "RBE output dir variable not defined",
-	}, /*{
+	}, {
 		description:         "stopRBE failed",
 		rbeOutputDirDefined: true,
-		bootstrapProgram:    "#!/bin/bash\nexit 1",
+		bootstrapProgram:    "#!/bin/bash\nexit 1\n",
 		expectedErr:         "shutdown failed",
 	}, {
 		description:         "failed to copy metrics file",
 		rbeOutputDirDefined: true,
-		bootstrapProgram:    "#!/bin/bash",
+		bootstrapProgram:    "#!/bin/bash\n",
 		expectedErr:         "failed to copy",
-	}*/}
+	}}
 
 	for _, tt := range tests {
 		t.Run(tt.description, func(t *testing.T) {
@@ -139,4 +139,4 @@
 	}
 }
 
-var rbeBootstrapProgram = fmt.Sprintf("#!/bin/bash\necho 1 > $RBE_output_dir/%s", rbeMetricsPBFilename)
+var rbeBootstrapProgram = fmt.Sprintf("#!/bin/bash\necho 1 > $RBE_output_dir/%s\n", rbeMetricsPBFilename)