Use of skygw_log_write() in ss_dassert and ss_info_dassert replaced
with the use of MXS_ERROR(). In addition, ss_dassert and ss_info_dassert
are now expressions that require a trailing ;.
Now handled by defining the relevant defines. Should be fixed
by replacing the use of ss_info_assert with test macros that
always assert.
Task for fixing this properly:
https://mariadb.atlassian.net/browse/MXS-382