save only global processes on global zone ps

Save only processes that are running in the global zone on Solaris.
Including the argument list in the function name inside Log()'s message is overkill.  C doesn't have function overloading by signature, so there is only one ZLoadProcesstable; giving its signature is no clarification.  If its parameter were something it'd be useful to print, `"ZLoadProcesstable(%q): ...", parameter, ...` might make some sense, but not here.

(I'm mildly surprised `Log(lvl, fmt, ...)` isn't a macro expanding to something like `LogInternal(__FILE__, __LINE__, __FUNCTION__, lvl, fmt, ...)` but, apparently, it's not.)