Use try with resources for buffered writers and file writers

With the latest Eclipse settings, a warning was shown when objects
that implement Autoclosable interface are not handled within a
try-with-resources statement.

Use try-with-resources for BufferedWriters and FileWriters.

Change-Id: Icea1da6984857d177e1e296c4dfabe450b570b9c

src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/RuleBaseTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/RuleBaseTest.java b/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/RuleBaseTest.java
index c965349..596afc7 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/RuleBaseTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/RuleBaseTest.java
@@ -378,11 +378,10 @@
       assertTrue("Failed to create parent (" + ruleBaseParentFile + ") for " +
           "rule base", ruleBaseParentFile.mkdirs());
     }
-    FileWriter unbufferedWriter = new FileWriter(ruleBaseFile);
-    BufferedWriter writer = new BufferedWriter(unbufferedWriter);
-    writer.write(rules);
-    writer.close();
-    unbufferedWriter.close();
+    try (FileWriter unbufferedWriter = new FileWriter(ruleBaseFile);
+        BufferedWriter writer = new BufferedWriter(unbufferedWriter)) {
+      writer.write(rules);
+    }
   }
 
   @Override

src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/action/AddVelocityCommentTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/action/AddVelocityCommentTest.java b/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/action/AddVelocityCommentTest.java
index b24c13f..5a33db6 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/action/AddVelocityCommentTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/its/base/workflow/action/AddVelocityCommentTest.java
@@ -360,11 +360,10 @@
         "rule base", templateParentFile.mkdirs());
     File templateFile = new File(templateParentFile, "test-template.vm");
 
-    FileWriter unbufferedWriter = new FileWriter(templateFile);
-    BufferedWriter writer = new BufferedWriter(unbufferedWriter);
-    writer.write(template);
-    writer.close();
-    unbufferedWriter.close();
+    try (FileWriter unbufferedWriter = new FileWriter(templateFile);
+        BufferedWriter writer = new BufferedWriter(unbufferedWriter)) {
+      writer.write(template);
+    }
   }
 
   @Override