-Fix problem where xfork did not successfully relinquish open db handles (with this change, fuser on a sqlite file, for instance, looks much more correct)

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@4376 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -335,6 +335,7 @@ sub xfork
         #my %drivers = DBI->installed_drivers;
         foreach (values %{$::XCAT_DBHS})
         {    #@{$drh->{ChildHandles}}) {
+            if ($_) { $_->disconnect(); }
             $_->{InactiveDestroy} = 1;
             undef $_;
         }