Only warn when created test directory cannot be deleted

com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/TestBase.java

@@ -850,7 +850,7 @@ public class TestBase {
     protected static boolean deleteDir(Path dir) {
         try {
             Files.walkFileTree(dir, DELETE_VISITOR);
-        } catch (Exception e) {
+        } catch (Throwable e) {
             return false;
         }
         return true;

com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/library/base/TestConnections.java

@@ -52,7 +52,7 @@ public class TestConnections extends TestBase {
     @AfterClass
     public static void teardownTestDir() {
         if (!deleteDir(testDir.testDirPath)) {
-            throw new AssertionError();
+            System.err.println("WARNING: error deleting : " + testDir.testDirPath);
         }
     }
 

com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/rpackages/TestRPackages.java

@@ -150,8 +150,7 @@ public abstract class TestRPackages extends TestBase {
         Path packageDir = installDir().resolve(packageName);
         try {
             deleteDir(packageDir);
-        } catch (Exception e) {
-            e.printStackTrace();
+        } catch (Throwable e) {
             return false;
         }
         return true;
@@ -205,7 +204,7 @@ public abstract class TestRPackages extends TestBase {
         if (!checkOnly()) {
             for (String p : testPackages) {
                 if (!uninstallPackage(p)) {
-                    throw new AssertionError();
+                    System.err.println("WARNING: error deleting package: " + p);
                 }
             }
         }