packaging: Fix text aligned not properly for long strings.

During the upgrade process we display the stages of of upgrade.
When strings are longer than 70 chars the text doesn't align
correctly. This patch fixes the issue by taking into cosideration
only the last part of a multiline string.

Bug-Url: https://bugzilla.redhat.com/882689
Change-Id: Id242e8a247ae720b3aeb37f40004241dfc3920de
Signed-off-by: Alex Lourie <alourie@redhat.com>