Description of problem:

The article for Package Caching for Red Hat Ceph Storage on Ubuntu needs following changes :

Under the section Using the Caching Server :

1) The point 1 (a) For a caching server with online repositories 
   should either be removed or modified with some other method 

2) The link for Red Hat Ceph Storage 3 Installation Guide for Ubuntu needs to 
   be added in the 3rd point

Following Note can also be added regarding ceph 3 installation:

If using caching server for ceph 3.0 installation, when editing the all.yml file during the installation, the parameter "ceph_rhcs_cdn_debian_repo" in that file needs to be modified and user have to provide credentials for ansible to automatically enable and access online ubuntu ceph repos.
 Example:
 ceph_rhcs_cdn_debian_repo: http://[caching_server]:3142/HTTPS///customername:customerpasswd@rhcs.download.redhat.com

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