Harmonize 'healthcheck' -command help and error log not to have
'SDL CLI error' prefix as there is no such a prefix in 'set' and 'get'
-commands either.
Add 'healthcheck' -command line arguments count check.
Issue-Id: RIC-113
Signed-off-by: Timo Tietavainen <timo.tietavainen@nokia.com>
Change-Id: I5e039edd9cdd3d70a9a13a1f116d7f0309618ef5