Revert "Cleanup: Remove HaltedClock (elastic/x-pack-elasticsearch#3664)"

This reverts commit elastic/x-pack-elasticsearch@f91c401a60 due to
failing tests, like

./gradlew :x-pack-elasticsearch:plugin:watcher:test -Dtests.seed=AE30350FCE96D26D -Dtests.class=org.elasticsearch.xpack.watcher.watch.WatchTests -Dtests.method="testParserSelfGenerated" -Dtests.security.manager=true -Dtests.locale=ja-JP -Dtests.timezone=EET

Original commit: elastic/x-pack-elasticsearch@e45d79d643

plugin/core/src/main/java/org/elasticsearch/xpack/common/time/HaltedClock.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+package org.elasticsearch.xpack.common.time;
+
+import org.joda.time.DateTime;
+import org.joda.time.DateTimeZone;
+
+import java.time.Clock;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZoneOffset;
+
+public class HaltedClock extends Clock {
+
+    private final DateTime now;
+
+    public HaltedClock(DateTime now) {
+        this.now = now.toDateTime(DateTimeZone.UTC);
+    }
+
+    @Override
+    public ZoneId getZone() {
+        return ZoneOffset.UTC;
+    }
+
+    @Override
+    public Clock withZone(ZoneId zoneId) {
+        if (zoneId.equals(ZoneOffset.UTC)) {
+            return this;
+        }
+
+        throw new IllegalArgumentException("Halted clock time zone cannot be changed");
+    }
+
+    @Override
+    public long millis() {
+        return now.getMillis();
+    }
+
+    @Override
+    public Instant instant() {
+        return Instant.ofEpochMilli(now.getMillis());
+    }
+}

plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/saml/SamlLogoutRequestMessageBuilderTests.java

@@ -6,10 +6,11 @@
 package org.elasticsearch.xpack.security.authc.saml;
 
 import java.time.Clock;
-import java.time.Instant;
-import java.time.ZoneOffset;
 
+import org.elasticsearch.xpack.common.time.HaltedClock;
 import org.hamcrest.Matchers;
+import org.joda.time.DateTime;
+import org.joda.time.DateTimeZone;
 import org.junit.Before;
 import org.opensaml.saml.common.xml.SAMLConstants;
 import org.opensaml.saml.saml2.core.LogoutRequest;
@@ -66,8 +67,8 @@ public class SamlLogoutRequestMessageBuilderTests extends SamlTestCase {
                 "http://idp.example.com/saml/logout/artifact");
         idpRole.getSingleLogoutServices().add(sloArtifact);
 
-        Clock fixedClock = Clock.fixed(Instant.now(), ZoneOffset.UTC);
-        final SamlLogoutRequestMessageBuilder builder = new SamlLogoutRequestMessageBuilder(fixedClock, sp, idp, nameId, session);
+        final DateTime now = DateTime.now(DateTimeZone.UTC);
+        final SamlLogoutRequestMessageBuilder builder = new SamlLogoutRequestMessageBuilder(new HaltedClock(now), sp, idp, nameId, session);
         final LogoutRequest logoutRequest = builder.build();
         assertThat(logoutRequest, notNullValue());
         assertThat(logoutRequest.getReason(), nullValue());
@@ -81,7 +82,7 @@ public class SamlLogoutRequestMessageBuilderTests extends SamlTestCase {
         assertThat(logoutRequest.getConsent(), nullValue());
         assertThat(logoutRequest.getNotOnOrAfter(), nullValue());
         assertThat(logoutRequest.getIssueInstant(), notNullValue());
-        assertThat(logoutRequest.getIssueInstant().getMillis(), equalTo(fixedClock.millis()));
+        assertThat(logoutRequest.getIssueInstant(), equalTo(now));
         assertThat(logoutRequest.getSessionIndexes(), iterableWithSize(1));
         assertThat(logoutRequest.getSessionIndexes().get(0).getSessionIndex(), equalTo(session));
         assertThat(logoutRequest.getDestination(), equalTo("http://idp.example.com/saml/logout/redirect"));

plugin/watcher/src/main/java/org/elasticsearch/xpack/watcher/watch/WatchParser.java

@@ -29,12 +29,11 @@ import org.elasticsearch.xpack.watcher.support.xcontent.WatcherXContentParser;
 import org.elasticsearch.xpack.watcher.transform.ExecutableTransform;
 import org.elasticsearch.xpack.watcher.trigger.Trigger;
 import org.elasticsearch.xpack.watcher.trigger.TriggerService;
+import org.elasticsearch.xpack.common.time.HaltedClock;
 import org.joda.time.DateTime;
 
 import java.io.IOException;
 import java.time.Clock;
-import java.time.Instant;
-import java.time.ZoneOffset;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
@@ -103,9 +102,8 @@ public class WatchParser extends AbstractComponent {
         XContentParser parser = null;
         try {
             // EMPTY is safe here because we never use namedObject
-            Clock fixedClock = Clock.fixed(Instant.now(), ZoneOffset.UTC);
-            parser = new WatcherXContentParser(xContentType.xContent().createParser(NamedXContentRegistry.EMPTY, source), fixedClock,
-                    withSecrets ? cryptoService : null);
+            parser = new WatcherXContentParser(xContentType.xContent().createParser(NamedXContentRegistry.EMPTY, source),
+                    new HaltedClock(now), withSecrets ? cryptoService : null);
             parser.nextToken();
             return parse(id, includeStatus, parser);
         } catch (IOException ioe) {