packaging: setup: removing 'Datacenter storage type' from the summary

Removing an entry from the installation summary.

Change-Id: I6042db9c4aa4653ce3329665b0a10a53a727c7df
Bug-Url: https://bugzilla.redhat.com/1102021
Signed-off-by: Simone Tiraboschi <stirabos@redhat.com>