gnocchi: take care of centos/source on non-x86

As for Debian we need to install blas/lapack devel headers to build
scipy.

Change-Id: I2e0257072192bae6b689d549df12a05196ff7698
Partially-Implements: blueprint multiarch-and-arm64-containers

docker/gnocchi/gnocchi-base/Dockerfile.j2

@@ -46,6 +46,17 @@ RUN truncate -s 0 /etc/apache2/ports.conf
             'python-ldappool',
             'python-rados'
         ] %}
+
+        # on x86-64 pip grabs precompiled numpy/scipy - on aarch64/ppc64le
+        # it needs to be built
+
+        {% if base_arch != 'x86_64' %}
+            {% set gnocchi_base_packages = gnocchi_base_packages + [
+                'blas-devel',
+                'lapack-devel'
+            ] %}
+        {% endif %}
+
 {{ macros.install_packages(gnocchi_base_packages | customizable("packages")) }}
 RUN mkdir -p /var/www/cgi-bin/gnocchi \
     && sed -i -r 's,^(Listen 80),#\1,' /etc/httpd/conf/httpd.conf \