use constant for database initializer bean name

nflow-engine/src/main/java/com/nitorcreations/nflow/engine/internal/dao/ExecutorDao.java

@@ -1,6 +1,7 @@
 package com.nitorcreations.nflow.engine.internal.dao;
 
 import static com.nitorcreations.nflow.engine.internal.dao.DaoUtil.toDateTime;
+import static com.nitorcreations.nflow.engine.internal.storage.db.DatabaseConfiguration.NFLOW_DATABASE_INITIALIZER;
 import static com.nitorcreations.nflow.engine.internal.storage.db.DatabaseConfiguration.NFLOW_JDBC;
 import static java.util.concurrent.TimeUnit.MINUTES;
 import static org.apache.commons.lang3.StringUtils.trimToNull;
@@ -35,7 +36,7 @@
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 
 @Component
-@DependsOn("nflowDatabaseInitializer")
+@DependsOn(NFLOW_DATABASE_INITIALIZER)
 public class ExecutorDao {
   private JdbcTemplate jdbc;
   final SQLVariants sqlVariants;

nflow-engine/src/main/java/com/nitorcreations/nflow/engine/internal/storage/db/DatabaseConfiguration.java

@@ -20,6 +20,7 @@ public abstract class DatabaseConfiguration {
   public static final String NFLOW_JDBC = "nflowJdbc";
   public static final String NFLOW_NAMED_JDBC = "nflowNamedJdbc";
   public static final String NFLOW_DATASOURCE = "nflowDatasource";
+  public static final String NFLOW_DATABASE_INITIALIZER = "nflowDatabaseInitializer";
   private static final Logger logger = getLogger(DatabaseConfiguration.class);
   private final String dbType;
 
@@ -67,7 +68,7 @@ protected <T> T property(Environment env, String key, Class<T> type) {
     return val;
   }
 
-  @Bean(name = "nflowDatabaseInitializer")
+  @Bean(name = NFLOW_DATABASE_INITIALIZER)
   public DatabaseInitializer nflowDatabaseInitializer(@Named(NFLOW_DATASOURCE) DataSource dataSource, Environment env) {
     return new DatabaseInitializer(dbType, dataSource, env);
   }

nflow-engine/src/main/java/com/nitorcreations/nflow/engine/internal/storage/db/MysqlDatabaseConfiguration.java

@@ -27,7 +27,7 @@ public MysqlDatabaseConfiguration() {
     super("mysql");
   }
 
-  @Bean(name="nflowDatabaseInitializer")
+  @Bean(name = NFLOW_DATABASE_INITIALIZER)
   @Override
   public DatabaseInitializer nflowDatabaseInitializer(@Named(NFLOW_DATASOURCE) DataSource dataSource, Environment env) {
     String dbType = "mysql";