Rename checktyle file as it is not an EJS template

generators/server/templates/config/checkstyle/checkstyle.xml

@@ -0,0 +1,24 @@
+<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+        "https://www.puppycrawl.com/dtds/configuration_1_3.dtd">
+<module name="Checker">
+
+    <property name="charset" value="UTF-8"/>
+    <!-- Configure checker to run on files with all file extensions (empty is all) -->
+    <property name="fileExtensions" value=""/>
+
+    <module name="io.spring.nohttp.checkstyle.check.NoHttpCheck">
+        <property name="whitelistFileName" value="${nohttp.checkstyle.whitelistFileName}" default=""/>
+    </module>
+
+    <module name="SuppressionFilter">
+        <property name="file" value="${config_loc}/suppressions.xml" default=""/>
+        <property name="optional" value="true"/>
+    </module>
+
+    <!-- Allow suppression with comments
+       // CHECKSTYLE:OFF
+       ... ignored content ...
+       // CHECKSTYLE:ON
+    -->
+    <module name="SuppressWithPlainTextCommentFilter"/>
+</module>