Merge pull request #1691 from /issues/1689-toString-cycle-backport

Fix #1689: Cycle in toString of RecoveryCodeEntity and ApplicationEntity (1.6.x)

powerauth-java-server/src/main/java/io/getlime/security/powerauth/app/server/database/model/entity/RecoveryCodeEntity.java

@@ -384,7 +384,7 @@ public boolean equals(Object obj) {
     public String toString() {
         return "RecoveryCodeEntity{"
                 + "id=" + id
-                + ", application=" + application.toString()
+                + ", applicationId=" + application.getId()
                 + ", userId=" + userId
                 + ", activationId=" + activationId
                 + ", status=" + status