Fix refresh for Solaris smf

[mtelka]

There is no :hup token for Solaris/illumos SMF methods. The HUP signal is sent using :kill -HUP instead. See also:

• https://docs.oracle.com/cd/E86824_01/html/E54776/smf-method-5.html#REFMAN5smf-method-5
• https://illumos.org/man/7/smf_method