Fix #319 Ignore plugins bundled under detached-plugins

Fix plugins.sh test
diff --git a/tests/tests.bats b/tests/tests.bats
index 81cca41..7cdbb5d 100644
--- a/tests/tests.bats
+++ b/tests/tests.bats
@@ -57,8 +57,8 @@
   # replace DOS line endings \r\n
   run bash -c "docker run -ti --rm $SUT_IMAGE-plugins ls --color=never -1 /var/jenkins_home/plugins | tr -d '\r'"
   assert_success
-  refute_line 'maven-plugin.jpi'
-  refute_line 'maven-plugin.jpi.pinned'
+  assert_line 'maven-plugin.jpi'
+  assert_line 'maven-plugin.jpi.pinned'
   assert_line 'ant.jpi'
   assert_line 'ant.jpi.pinned'
 }