kdump_page: Catch KeyboardInterrupt when inputting "Ctrl+c"

Previously when inputting "Ctrl+c" during configuring KDump SSH,
the UI will quit.
Now try to catch KeyboardInterrupt and remove kdump configured files
instead of quitting the whole application

Change-Id: Idefe3c12abfbd253add0c286b064eec78cb91304
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=989389
Signed-off-by: hadong <hadong0720@gmail.com>