Fix build of monasca-grafana

This patch is adding libffi-dev to build_packages
for Debian/Ubuntu which is fixing monasca-grafana build.

Change-Id: I67f93687d70f1c8c92719857cbf74971d9a17ae6
(cherry picked from commit 88d4895)

Author: keuko

docker/monasca/monasca-grafana/Dockerfile.j2

@@ -11,29 +11,30 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 
 {% if base_package_type == 'rpm' %}
     {% set monasca_grafana_build_packages = [
-        'golang',
-        'git',
-        'npm',
         'bzip2',
+        'fontconfig',
         'gcc-c++',
+        'git',
+        'golang',
         'make',
+        'npm',
+        'rpm-build',
         'ruby',
-        'ruby-devel',
-        'fontconfig',
-        'rpm-build'
+        'ruby-devel'
      ] %}
 {% elif base_package_type == 'deb' %}
     {% set monasca_grafana_build_packages = [
-        'golang',
-        'git',
-        'npm',
         'bzip2',
+        'fontconfig',
         'g++',
+        'git',
+        'golang',
+        'libffi-dev',
         'make',
+        'npm',
+        'rpm',
         'ruby',
-        'ruby-dev',
-        'fontconfig',
-        'rpm'
+        'ruby-dev'
      ] %}
 {% endif %}