remove ppa:rwky/redis setup.sh

Closes-Bug: #1665799

ppa:rwky/redis is no more maintained.
testing:
1. installation went through fine
2. logged to sm-webui, able to login and browsed through web pages.

Change-Id: I9ec29cb63832a4ecc25a3ef52454a37b21c0da2c

build/deb_server_manager_setup.sh

@@ -182,7 +182,7 @@ function setup_internet_repos()
   fi
 
   # Repo to add for redis - required for contrail-web-core
-  add-apt-repository ppa:rwky/redis --yes >> $log_file 2>&1
+  #add-apt-repository ppa:rwky/redis --yes >> $log_file 2>&1
 
   # Cobbler repo to be added if this is not an SMLITE install
   if [ "$SMLITE" == "" ]; then