eliminate TEST_ONLY differentiation

devstack is a development and test environment, but by default we were
only installing the runtime dependencies. We should install all the
testing required packages as well.

Change-Id: I7c95927b9daad15766aac9d1276b10ca62efb24c
diff --git a/files/debs/trove b/files/debs/trove
index 09dcee8..96f8f29 100644
--- a/files/debs/trove
+++ b/files/debs/trove
@@ -1 +1 @@
-libxslt1-dev   # testonly
+libxslt1-dev