Syntax fixes for kdump in mount.umount and Transaction

Add .insert to transaction instead of just .append, which doesn't
seem to have been there previously.

Use LOGGER instead of self.logger for mount.umount

Change-Id: Ia5c2b46836188d7b8355df31982b0e133cfb80dc
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1095140
Signed-off-by: Ryan Barry <rbarry@redhat.com>