Added Trove (Database as a Service).

- Added changes to stackrc for the Trove Repos.
- Added support to devstack for "install", "configure",
  "init", and "run"

implements blueprint:trove-devstack-integration

Change-Id: Ib3f6daad33e629f764a174b80762c808ce8588e2
diff --git a/files/apts/trove b/files/apts/trove
new file mode 100644
index 0000000..09dcee8
--- /dev/null
+++ b/files/apts/trove
@@ -0,0 +1 @@
+libxslt1-dev   # testonly