SGF-476 - Implement ServerLauncherCacheProvider to launch geode with spring.

Geode has removed the direct dependency on spring data gemfire in favor
of using a ServiceLoader to allow overriding the behavior of geode's server
launcher start behavior. Implementing the ServerLauncherCacheProvider
interface to allow SDG to override the server launcher behavior to parse
a spring xml file, if present.

src/test/resources/SpringServerLauncherCacheProviderIntegrationTest-context.xml

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- data source Spring XML configuration file and meta-data, using GemFire -->
+<beans xmlns="http://www.springframework.org/schema/beans"
+	   xmlns:gfe="http://www.springframework.org/schema/gemfire"
+	   xmlns:util="http://www.springframework.org/schema/util"
+	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	   xsi:schemaLocation="
+        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/gemfire http://www.springframework.org/schema/gemfire/spring-gemfire.xsd
+        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
+">
+
+	<util:properties id="gemfireProperties">
+		<prop key="name">SpringContextBootstrappingInitializerTest</prop>
+		<prop key="statistic-sampling-enabled">false</prop>
+		<prop key="mcast-port">0</prop>
+		<prop key="log-level">config</prop>
+	</util:properties>
+
+	<gfe:cache properties-ref="gemfireProperties" use-bean-factory-locator="false"
+	  critical-heap-percentage="55"/>
+
+	<gfe:replicated-region id="TestRegion" persistent="false"/>
+
+</beans>