Drop Neo4J SessionFactoryProvider

Remove SessionFactoryProvider since it's no longer needed for
auto-configuration.

See gh-6142

spring-boot/src/main/java/org/springframework/boot/neo4j/SessionFactoryProvider.java

-/*
- * Copyright 2012-2016 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.springframework.boot.neo4j;
-
-import org.neo4j.ogm.config.Configuration;
-import org.neo4j.ogm.session.SessionFactory;
-
-/**
- * Provide a Neo4j {@link SessionFactory} instance based on a configurable
- * {@link Configuration} and custom packages to scan.
- *
- * @author Stephane Nicoll
- * @since 1.4.0
- */
-public class SessionFactoryProvider {
-
-	private Configuration configuration;
-
-	private String[] packagesToScan;
-
-	/**
-	 * Set the configuration to use.
-	 * @param configuration the configuration
-	 */
-	public void setConfiguration(Configuration configuration) {
-		this.configuration = configuration;
-	}
-
-	/**
-	 * Set the packages to scan.
-	 * @param packagesToScan the packages to scan
-	 */
-	public void setPackagesToScan(String... packagesToScan) {
-		this.packagesToScan = packagesToScan;
-	}
-
-	public SessionFactory getSessionFactory() {
-		return new SessionFactory(this.configuration, this.packagesToScan);
-	}
-
-}

spring-boot/src/main/java/org/springframework/boot/neo4j/package-info.java

-/*
- * Copyright 2012-2016 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/**
- * Neo4j support classes.
- */
-package org.springframework.boot.neo4j;