Rename FormLoginConfigurerTests to FormLoginConfigurerSpec

Rename so can add new Java based tests for gh-5582

Issue: gh-5582

config/src/test/groovy/org/springframework/security/config/annotation/web/configurers/FormLoginConfigurerTests.groovy → config/src/test/groovy/org/springframework/security/config/annotation/web/configurers/FormLoginConfigurerSpec.groovy

@@ -57,7 +57,7 @@ import spock.lang.Unroll
  *
  * @author Rob Winch
  */
-class FormLoginConfigurerTests extends BaseSpringSpec {
+class FormLoginConfigurerSpec extends BaseSpringSpec {
 	def "Form Login"() {
 		when: "load formLogin()"
 			context = new AnnotationConfigApplicationContext(FormLoginConfig)