dao yml assembly to conf directory (#942)

* add ConnectionFactoryTest and ConnectionFactory read datasource from appliction.yml

* .escheduler_env.sh to dolphinscheduler_env.sh

* dao yml assembly to conf directory

dolphinscheduler-server/src/main/assembly/package.xml

@@ -40,6 +40,7 @@
 				<include>**/*.properties</include>
 				<include>**/*.xml</include>
 				<include>**/*.json</include>
+				<include>**/*.yml</include>
 			</includes>
 			<outputDirectory>conf</outputDirectory>
 		</fileSet>