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: I20a8ab68463e96acf5ca864c28b1d6662b734123
Bug-Url: https://bugzilla.redhat.com/1031604
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>