added installation for edge sso

install-edge-sso.yml

diff --git a/install-edge-sso.yml b/install-edge-sso.yml
index 3b448f6..63a035f 100644
--- a/install-edge-sso.yml
+++ b/install-edge-sso.yml
@@ -3,7 +3,7 @@
   tags: ['cache']
   import_playbook: apigee-planet-cache.yml
   vars:
-    target_hosts: edge
+    target_hosts: edge,sso
 
 - name: Install and configure Openldap pre-requisites
   import_playbook: apigee-os-pre-requisites-epel.yml