Fixed URL pointing to Keystone Scripts

The URL(s) pointing to the Keystone Scripts are fixed, pointing to
raw.github.com for providing the required scripts to the users are
required.

Change-Id: I5a9ca4010b97d08b2aeae28b70ffbac29bf67bae
Closes-Bug: #1275206
Merge "Fixed URL pointing to Keystone Scripts"