tcmu: use compile time parameter defaults
tcmu: use compile time parameter defaults

The tcmu_elasto_args global contains the default state for all
parameters, so use it while parsing parameters and printing usage.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

ddiss/elasto,ddiss/elasto