Fix problem where nodeset install on esxi4.x media would fail

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@14080 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server/lib/xcat/plugins/anaconda.pm

@@ -1487,6 +1487,7 @@ sub copyesxiboot {
     my $targetdir = shift;
     # this just does the same thing that the stateless version does.
     unless(-f "$targetdir/mod.tgz"){
+	require xCAT_plugin::esx;
         xCAT_plugin::esx::makecustomizedmod('esxi', $targetdir);
     }
     my @files = qw(mboot.c32 vmkboot.gz vmkernel.gz sys.vgz cim.vgz ienviron.vgz install.vgz);