Set default ensemble size to 2 in service conf, to match broker.conf (#5359)

* Set default ensemble size to 2 in service conf, to match broker.conf

* Fixed test

(cherry picked from commit be5a7cf9)

pulsar-broker-common/src/main/java/org/apache/pulsar/broker/ServiceConfiguration.java

@@ -777,19 +777,19 @@ public class ServiceConfiguration implements PulsarConfiguration {
         category = CATEGORY_STORAGE_ML,
         doc = "Number of bookies to use when creating a ledger"
     )
-    private int managedLedgerDefaultEnsembleSize = 1;
+    private int managedLedgerDefaultEnsembleSize = 2;
     @FieldContext(
         minValue = 1,
         category = CATEGORY_STORAGE_ML,
         doc = "Number of copies to store for each message"
     )
-    private int managedLedgerDefaultWriteQuorum = 1;
+    private int managedLedgerDefaultWriteQuorum = 2;
     @FieldContext(
         minValue = 1,
         category = CATEGORY_STORAGE_ML,
         doc = "Number of guaranteed copies (acks to wait before write is complete)"
     )
-    private int managedLedgerDefaultAckQuorum = 1;
+    private int managedLedgerDefaultAckQuorum = 2;
 
     //
     //

pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/AdminApiTest.java

@@ -672,7 +672,7 @@ public class AdminApiTest extends MockedPulsarServiceBaseTest {
         policies.auth_policies.namespace_auth.remove("my-role");
         assertEquals(admin.namespaces().getPolicies("prop-xyz/ns1"), policies);
 
-        assertEquals(admin.namespaces().getPersistence("prop-xyz/ns1"), new PersistencePolicies(1, 1, 1, 0.0));
+        assertEquals(admin.namespaces().getPersistence("prop-xyz/ns1"), new PersistencePolicies(2, 2, 2, 0.0));
         admin.namespaces().setPersistence("prop-xyz/ns1", new PersistencePolicies(3, 2, 1, 10.0));
         assertEquals(admin.namespaces().getPersistence("prop-xyz/ns1"), new PersistencePolicies(3, 2, 1, 10.0));
 

pulsar-broker/src/test/java/org/apache/pulsar/broker/admin/v1/V1_AdminApiTest.java

@@ -646,7 +646,7 @@ public class V1_AdminApiTest extends MockedPulsarServiceBaseTest {
         policies.auth_policies.namespace_auth.remove("my-role");
         assertEquals(admin.namespaces().getPolicies("prop-xyz/use/ns1"), policies);
 
-        assertEquals(admin.namespaces().getPersistence("prop-xyz/use/ns1"), new PersistencePolicies(1, 1, 1, 0.0));
+        assertEquals(admin.namespaces().getPersistence("prop-xyz/use/ns1"), new PersistencePolicies(2, 2, 2, 0.0));
         admin.namespaces().setPersistence("prop-xyz/use/ns1", new PersistencePolicies(3, 2, 1, 10.0));
         assertEquals(admin.namespaces().getPersistence("prop-xyz/use/ns1"), new PersistencePolicies(3, 2, 1, 10.0));