install python-psycopg2 for postgresql setup

Former-commit-id: 0f6caa940cb84ba9df006d975149384096a62138

ansible/deploy.yaml

@@ -41,6 +41,9 @@
     - name: install httpd-devel
       yum: name=httpd-devel state=present update_cache=yes
       become: true
+    - name: install python-psycopg2
+      yum: name=python-psycopg2 state=present update_cache=yes
+      become: true
     - name: install mod_wsgi
       pip: name=mod_wsgi extra_args=--upgrade executable=pip3
       become: true