Removed hostname from known_hosts file after rmvm.

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@10767 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

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

@@ -549,6 +549,9 @@ sub removeVM {
 	xCAT::zvmUtils->delTabEntry( 'noderes',  'node', $node );
 	xCAT::zvmUtils->delTabEntry( 'nodehm',   'node', $node );
 
+	# Remove old hostname from known_hosts
+	$out = `ssh-keygen -R $node`;
+
 	return;
 }