SEC-2542: Polish dependency exclusions

This cleans up exclusions so the pom.xml are not as cluttered.

samples/cas/sample-xml/cassample.gradle

@@ -40,13 +40,13 @@ dependencies {
 
     integrationTestCompile project(':spring-security-cas'),
                    "org.seleniumhq.selenium:selenium-htmlunit-driver:$seleniumVersion",
-                   "org.spockframework:spock-core:$spockVersion",
                    "org.gebish:geb-spock:$gebVersion",
                    'commons-httpclient:commons-httpclient:3.1',
                    "org.eclipse.jetty:jetty-server:$jettyVersion",
                    "org.eclipse.jetty:jetty-servlet:$jettyVersion",
                    "org.codehaus.groovy:groovy:$groovyVersion",
-                   "org.slf4j:jcl-over-slf4j:$slf4jVersion"
+                   "org.slf4j:jcl-over-slf4j:$slf4jVersion",
+                   spockDependencies
 }
 
 [jettyRun, jettyRunWar]*.configure {

samples/cas/sample-xml/pom.xml

@@ -189,6 +189,24 @@
       <artifactId>spock-core</artifactId>
       <version>0.7-groovy-2.0</version>
       <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <artifactId>junit-dep</artifactId>
+          <groupId>junit</groupId>
+        </exclusion>
+      </exclusions>
+    </dependency>
+    <dependency>
+      <groupId>org.spockframework</groupId>
+      <artifactId>spock-spring</artifactId>
+      <version>0.7-groovy-2.0</version>
+      <scope>test</scope>
+      <exclusions>
+        <exclusion>
+          <artifactId>junit-dep</artifactId>
+          <groupId>junit</groupId>
+        </exclusion>
+      </exclusions>
     </dependency>
     <dependency>
       <groupId>org.springframework</groupId>