WS-2181: update adm -> 2.7.1

Author: Katsuya-Tomioka

pom.xml

@@ -54,7 +54,7 @@
         <maven-source-plugin.version>2.4</maven-source-plugin.version>
         <mockserver-version>3.10.2</mockserver-version>
         <site-skin-version>1.5</site-skin-version>
-        <bt-adm-version>2.7.1-SNAPSHOT</bt-adm-version>
+        <bt-adm-version>2.7.1</bt-adm-version>
     </properties>
     <modules>
         <module>annotations</module>