add numpy to package list, saves lots of time

websockify was added to the pip requires, and it has a dependency
of numpy. Because we didn't specify it in the package list, it was
built from source every time, adding 3 minutes to an average run.

Stop testing whether numpy compiles 100 times a day in CI.

Change-Id: Ic9d9b8135a917deb846911c6b266aec87d05781a
diff --git a/files/rpms/nova b/files/rpms/nova
index 88ad8c3..568ee7f 100644
--- a/files/rpms/nova
+++ b/files/rpms/nova
@@ -10,6 +10,7 @@
 libvirt-bin # NOPRIME
 libvirt-python
 libxml2-python
+numpy # needed by websockify for spice console
 m2crypto
 mysql-server # NOPRIME
 parted