[CABMAN] Make cabman exit with non-zero exit code if argument parsing fails (#4022)

Co-authored-by: Serge Gautherie <[email protected]>

sdk/tools/cabman/cabman.cxx

@@ -689,7 +689,7 @@ int main(int argc, char * argv[])
     CCABManager CABMgr;
 
     if (!CABMgr.ParseCmdline(argc, argv))
-        return false;
+        return 2;
 
     return CABMgr.Run() ? 0 : 1;
 }