li in foster parent case incorrectly handled

The result of parsing by html5lib for the following fragment is not compatible with the specification.

&lt;table>&lt;li>&lt;li>&lt;/li>&lt;/table>

It is parsed into the following DOM tree.

<pre>
&lt;li>
&lt;table>
   &lt;li>
</pre>


It should be parse as the following DOM tree.

<pre>
&lt;li>
&lt;li>
&lt;table>
</pre>
