Upgrade to Apache Shiro 1.7.1.

Resolves gh-511.

Author: jxblum

pom.xml

@@ -44,7 +44,7 @@
 		<java-module-name>spring.data.geode</java-module-name>
 		<source.level>1.8</source.level>
 		<antlr.version>2.7.7</antlr.version>
-		<apache-shiro.version>1.4.1</apache-shiro.version>
+		<apache-shiro.version>1.7.1</apache-shiro.version>
 		<cache-api.version>1.1.1</cache-api.version>
 		<log4j.version>2.12.1</log4j.version>
 		<multithreadedtc.version>1.01</multithreadedtc.version>