Add before and after logging for unit tests

Currently we have these logs for integration tests only.

This adds the following log at the start:
```
logger.info("[{}]: before test", getTestName());
```

and this is logged at the end, but before any clean up done in sub classes

```
 logger.info("[{}]: after test", getTestName());
```

Original commit: elastic/x-pack-elasticsearch@2ca7296665

elasticsearch/src/test/java/org/elasticsearch/license/AbstractLicenseServiceTestCase.java

@@ -69,7 +69,7 @@ public abstract class AbstractLicenseServiceTestCase extends ESTestCase {
     }
 
     @After
-    public void after() {
+    public void tearDown() {
         licenseService.stop();
     }
 }

elasticsearch/src/test/java/org/elasticsearch/xpack/common/http/HttpClientTests.java

@@ -62,7 +62,7 @@ public class HttpClientTests extends ESTestCase {
     }
 
     @After
-    public void after() throws Exception {
+    public void tearDown() throws Exception {
         webServer.shutdown();
     }
 

elasticsearch/src/test/java/org/elasticsearch/xpack/security/authz/accesscontrol/DocumentSubsetReaderTests.java

@@ -44,7 +44,7 @@ public class DocumentSubsetReaderTests extends ESTestCase {
     private BitsetFilterCache bitsetFilterCache;
 
     @Before
-    public void before() {
+    public void setUpDirectory() {
         directory = newDirectory();
         IndexSettings settings = IndexSettingsModule.newIndexSettings("_index", Settings.EMPTY);
         bitsetFilterCache = new BitsetFilterCache(settings, new BitsetFilterCache.Listener() {
@@ -61,7 +61,7 @@ public class DocumentSubsetReaderTests extends ESTestCase {
     }
 
     @After
-    public void after() throws Exception {
+    public void cleanDirectory() throws Exception {
         if (directoryReader != null) {
             directoryReader.close();
         }

elasticsearch/src/test/java/org/elasticsearch/xpack/security/authz/accesscontrol/SecurityIndexSearcherWrapperUnitTests.java

@@ -69,18 +69,18 @@ import org.elasticsearch.index.shard.ShardId;
 import org.elasticsearch.index.similarity.SimilarityService;
 import org.elasticsearch.indices.IndicesModule;
 import org.elasticsearch.indices.TermsLookup;
+import org.elasticsearch.license.XPackLicenseState;
 import org.elasticsearch.script.ExecutableScript;
 import org.elasticsearch.script.Script;
 import org.elasticsearch.script.ScriptContext;
 import org.elasticsearch.script.ScriptService;
 import org.elasticsearch.script.ScriptType;
 import org.elasticsearch.search.aggregations.LeafBucketCollector;
-import org.elasticsearch.xpack.security.authz.accesscontrol.DocumentSubsetReader.DocumentSubsetDirectoryReader;
-import org.elasticsearch.license.XPackLicenseState;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.test.IndexSettingsModule;
-import org.elasticsearch.xpack.security.user.User;
+import org.elasticsearch.xpack.security.authz.accesscontrol.DocumentSubsetReader.DocumentSubsetDirectoryReader;
 import org.elasticsearch.xpack.security.authz.permission.FieldPermissions;
+import org.elasticsearch.xpack.security.user.User;
 import org.junit.After;
 import org.junit.Before;
 import org.mockito.ArgumentCaptor;
@@ -122,7 +122,7 @@ public class SecurityIndexSearcherWrapperUnitTests extends ESTestCase {
     private IndexSettings indexSettings;
 
     @Before
-    public void before() throws Exception {
+    public void setup() throws Exception {
         Index index = new Index("_index", "testUUID");
         scriptService = mock(ScriptService.class);
         indexSettings = IndexSettingsModule.newIndexSettings(index, Settings.EMPTY);
@@ -149,7 +149,7 @@ public class SecurityIndexSearcherWrapperUnitTests extends ESTestCase {
     }
 
     @After
-    public void after() throws Exception {
+    public void tearDown() throws Exception {
         esIn.close();
     }