SGF-620 - Fix GemfireSimpleTypeHolderTest due to API changes in SDC SimpleTypeHolder.

src/test/resources/logback.xml

@@ -1,16 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <configuration>
-
     <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
         <encoder>
             <pattern>%d %5p %40.40c:%4L - %m%n</pattern>
         </encoder>
     </appender>
 
-    <logger name="org.springframework.data" level="error" />
+    <logger name="org.springframework" level="${logback.log.level:-error}"/>
 
-    <root level="warn">
+    <root level="${logback.log.level:-error}">
         <appender-ref ref="console" />
     </root>
-
 </configuration>