BAEL-8143 Update Mockito articles

-Mockito version fixes
-MessageMatcher implementation changed as ArugmentMatcher is an Interface now

spring-core/pom.xml

@@ -16,11 +16,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-all</artifactId>
-            <version>${mockito.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-test</artifactId>
@@ -82,15 +77,7 @@
         </plugins>
     </build>
 
-    <repositories>
-        <repository>
-            <id>java.net</id>
-            <url>https://maven.java.net/content/repositories/releases/</url>
-        </repository>
-    </repositories>
-
     <properties>
-        <mockito.version>2.21.0</mockito.version>
         <mockito.spring.boot.version>1.4.4.RELEASE</mockito.spring.boot.version>
         <javax.inject.version>1</javax.inject.version>
         <guava.version>20.0</guava.version>