loadtest-controller: use mustache as a rendering template for the report

Author: ivchicano

loadtest-controller/pom.xml

@@ -45,6 +45,12 @@
             <artifactId>spring-boot-starter</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>com.samskivert</groupId>
+            <artifactId>jmustache</artifactId>
+            <version>1.16</version>
+        </dependency>
+
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>