The term 'zapping' has been replaced by 'manual cleaning'. This
removes 'zapping' from the code. Since one of the changes is in
the help for a config option, ironic.conf.sample was updated
(note that it was out of date).
(References to 'zapping' in the documentation is addressed in a
separate patch.)
Change-Id: Icc0303cf26b464b84ba97636b41d9edfa16b8dbd
Partial-Bug: #1526290