Disable SSL integration tests temporarily

We disable SSL integration tests as  a workaround for
https://github.com/elastic/infra/issues/628 to ensure
other problems can still be caught.

Original commit: elastic/x-pack-elasticsearch@47bf56faec

qa/smoke-test-plugins-ssl/build.gradle

@@ -156,6 +156,7 @@ for (Project subproj : project.rootProject.subprojects) {
   }
 }
 
+/*
 integTest {
   cluster {
     // TODO: use some variable here for port number
@@ -183,3 +184,4 @@ integTest {
     }
   }
 } 
+*/