Put hamcrest and mockito into Maven test scope, close AsyncHttpClient#1549 (AsyncHttpClient#1550)

Author: ppalaga

pom.xml

@@ -388,11 +388,13 @@
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
       <version>${mockito.version}</version>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.hamcrest</groupId>
       <artifactId>java-hamcrest</artifactId>
       <version>${hamcrest.version}</version>
+      <scope>test</scope>
     </dependency>
   </dependencies>
   <properties>