save only global processes on global zone ps

Save only processes that are running in the global zone on Solaris.
Better to structure this as
```
if (is_global)
{
   if (is_root) { SeqAppend(rootpidlist, ...); }
   else { SeqAppend(pidlist, ...); }
}
```
or even
`if (is_global) { SeqAppend(is_root ? rootpidlist : pidlist, ...); }`