Adding python-memcache to pkgs

The patch adds python-memcache to pkg list. Barbican api
dependency on python-memcache therefore the pks is going
to be added and insatlled during barbican.server state.

Change-Id: Ic189b2d85a9bb0c04fc14489cae561776684203c
Related-PROD: PROD-21338 (PROD:21338)
diff --git a/barbican/map.jinja b/barbican/map.jinja
index ff15a84..ceab199 100644
--- a/barbican/map.jinja
+++ b/barbican/map.jinja
@@ -42,6 +42,11 @@
 {%- endload %}
 
 {%- set server = salt['grains.filter_by'](server_defaults, merge=salt['pillar.get']('barbican:server'), base='default') %}
+
+{%- if server.cache is defined %}
+  {%- do server.pkgs.append('python-memcache') %}
+{%- endif %}
+
 {# Dogtag cert source case #2: Cert from Mine. #}
 {%- if server.dogtag_admin_cert.engine == 'mine' %}
 {%- set dogtag_mine_admin_certs = salt['mine.get']('I@dogtag:server', 'dogtag_admin_cert', 'compound') %}