Install libffi package

... to fix the failure during installing fiddle.

Change-Id: I90644b6f03208fb0e41f18bf53b89281af764aaf
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

playbooks/prepare-node-common.yaml

@@ -51,6 +51,7 @@
           - zlib-devel
           - langpacks-en
           - glibc-langpack-en
+          - libffi-devel
 
       when:
         - ansible_os_family == 'RedHat'
@@ -82,6 +83,7 @@
         - libaugeas-dev
         - pkg-config
         - zlib1g-dev
+        - libffi-dev
         - python3-pip
 
     - name: Install Ruby dependencies (Debian)
@@ -97,4 +99,5 @@
         - libxslt1-dev
         - ruby-dev
         - zlib1g-dev
+        - libffi-dev
         - python3-pip