Plugins are generating tests for all contracts when using external contracts

When using contract plugins together with a shared repo with contracts we end up with creating contract tests for all the contracts. Stubs are created properly but tests generation ignores the path pattern.
With this change we fix the way tests are generated

fixes #155

spring-cloud-contract-verifier/src/main/groovy/org/springframework/cloud/contract/verifier/TestGenerator.groovy

@@ -58,7 +58,8 @@ class TestGenerator {
 		this.saver = saver
 		contractFileScanner = new ContractFileScanner(configProperties.contractsDslDir,
 				configProperties.excludedFiles as Set,
-				configProperties.ignoredFiles as Set)
+				configProperties.ignoredFiles as Set,
+				this.configProperties.includedContracts)
 	}
 
 	int generate() {