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/general b/files/debs/general
index 84d4302..5f10a20 100644
--- a/files/debs/general
+++ b/files/debs/general
@@ -6,7 +6,7 @@
 gcc
 g++
 git
-graphviz # testonly - docs
+graphviz # needed for docs
 lsof # useful when debugging
 openssh-server
 openssl