Make syscheck.debug in internal_options.conf work

This should allow the user to specify a debug level for the syscheck
daemon on NIX machines using the syscheck.debug option in the
internal_options.conf. The debug level specified on the command line
takes precedence. Also, added starting up messages to match what some of
the daemons do.

Original Pull Request: https://bitbucket.org/jbcheng/ossec-hids/pull-request/34/make-syscheckdebug-in-internal_optionsconf/diff