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/nova b/files/debs/nova
index 0c31385..9d9acde 100644
--- a/files/debs/nova
+++ b/files/debs/nova
@@ -4,7 +4,7 @@
 kpartx
 parted
 iputils-arping
-libmysqlclient-dev  # testonly
+libmysqlclient-dev
 mysql-server # NOPRIME
 python-mysqldb
 python-mysql.connector