Move 'samples' into 'tests' folder

Some of the samples are more like pure integratiuon tests (I wouldn't
use them to copy code into a real app). So I put them with the other
"test" projects.

samples/pom.xml

@@ -21,10 +21,6 @@
         <module>wiremock-jetty</module>
         <module>wiremock-tomcat</module>
         <module>wiremock-undertow</module>
-        <module>samples-messaging-camel</module>
-        <module>samples-messaging-spring</module>
-        <module>samples-messaging-integration</module>
-        <module>samples-messaging-stream</module>
     </modules>
 
  	<build>

tests/pom.xml

@@ -18,6 +18,10 @@
 	<description>Spring Cloud Contract Tests</description>
 
 	<modules>
+		<module>samples-messaging-camel</module>
+		<module>samples-messaging-spring</module>
+		<module>samples-messaging-stream</module>
+		<module>samples-messaging-integration</module>
 		<module>spring-cloud-contract-stub-runner-camel</module>
 		<module>spring-cloud-contract-stub-runner-integration</module>
 		<module>spring-cloud-contract-stub-runner-stream</module>