UX: remove alarming warning

After upgrading from 3.1 users was warned about a legacy config
still present in conf files if the user forgot to update .conf file
with the one provided by the package as .rpmnew.
The tool is able to use the legacy configuration so no need to
alarm the user about that.

Change-Id: I9759186af11f6894c9bb45735b39bb9ddee2bf30
Bug-Url: https://bugzilla.redhat.com/1031607
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>