Add let´s enrypt to geonode

Apache:GeoNode SSL-TLS LE Authority

# - Close port 8080 for inbound networking
# - Edit your local_settings to use proxy /geonode (and not port 8080)
# - Add following to local_settings: AVATAR_GRAVATAR_SSL = True
# - make sure mod_ssl is active: $ a2enmod ssl

# add let´s encrypt repository 
  $ sudo add-apt-repository ppa:certbot/certbot
  $ sudo apt-get update

# install certbot
  $ sudo apt-get install python-certbot-apache

# add cert
# - this will create certs and geonode-le-ssl.conf ! see comment 1 below
# - Further it will configure a cron job to regenerate certs before 90 days limit
# - (for multiple domains use $ sudo certbot --apache -d example.com -d www.example.com)
# - if your certs coming from another authority or you´d like to force ssh see comment 2
  $ sudo certbot --apache -d example.com

# export database
  $ pg_dump -U geonode -d geonode > /tmp/geonode.sql

# replace old http urls
  $ sed -i 's,http://example.com,https://example.com,g' /tmp/geonode.sql

# rename geonode database
  $ sudo -u postgres psql -c "ALTER DATABASE geonode RENAME TO geonode_bak"

# create tmp database
  $ sudo -u postgres createdb -O geonode geonode

# restore dump 
  $ sudo -u postgres psql -d geonode -f /tmp/geonode.sql

# if all is fine drop geonode_bak