Fixes for PT items: 70455086, 71974860, 71974808, 70384486. As part of
the fix, validation of credentials and cloud space in both CF New server
and Clone server wizards has been switched to event driven, with
validation occuring in a validatione event handler, that both listens
for incoming validation events, as well as notifies listeners when
validation has been completed. This mechanism is common to both wizard.