Make PluginConfigPeerInfoProvider a singleton

Change-Id: Ib2ded04fdfc1e71f9b5e1bb884fff36c79d38342
diff --git a/src/main/java/com/ericsson/gerrit/plugins/highavailability/peers/PluginConfigPeerInfoProvider.java b/src/main/java/com/ericsson/gerrit/plugins/highavailability/peers/PluginConfigPeerInfoProvider.java
index f9f182b..f39eb6b 100644
--- a/src/main/java/com/ericsson/gerrit/plugins/highavailability/peers/PluginConfigPeerInfoProvider.java
+++ b/src/main/java/com/ericsson/gerrit/plugins/highavailability/peers/PluginConfigPeerInfoProvider.java
@@ -17,8 +17,10 @@
 import com.ericsson.gerrit.plugins.highavailability.Configuration;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
+import com.google.inject.Singleton;
 import java.util.Optional;
 
+@Singleton
 public class PluginConfigPeerInfoProvider implements Provider<Optional<PeerInfo>> {
 
   private final Optional<PeerInfo> peerInfo;