title: NHibernate.SQL in log4net always logs on DEBUG
body: <p>I have the following problem - it looks as if log4net is ignoring level in logger configuration when it comes to NHibernate.SQL and always logs on DEBUG. </p>
  
  <p>If I change logger name to NHibernate it works fine and only messages above or equal to level are logged. </p>
  
  <p>Here is my config:</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
  &lt;log4net&gt; 
    &lt;appender name="console" type="log4net.Appender.ConsoleAppender"&gt;    
      &lt;layout type="log4net.Layout.PatternLayout"&gt;
        &lt;conversionPattern value="[%logger] %-5p %m%n" /&gt;
      &lt;/layout&gt;
    &lt;/appender&gt;
    &lt;logger name="NHibernate.SQL" additivity="false"&gt;
      &lt;level value="INFO" /&gt;
      &lt;appender-ref ref="console" /&gt;
    &lt;/logger&gt;
  &lt;/log4net&gt;
  </code></pre>
  
  <p>With this configuration I get following output:</p>
  
  <pre><code>[NHibernate.SQL] DEBUG Reading high value:select next_hi from hibernate_unique_key with (updlock, rowlock)
  [NHibernate.SQL] DEBUG Updating high value:update hibernate_unique_key set next_hi = @p0 where next_hi = @p1;@p0 = 247 [Type: Int64 (0)], @p1 = 246 [Type: Int64 (0)]
  </code></pre>
  
  <p>NHibernate.config</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt;
  &lt;hibernate-configuration xmlns="urn:nhibernate-configuration-2.2"&gt;
    &lt;session-factory&gt;
  
    &lt;property name="connection.connection_string"&gt;XXX&lt;/property&gt;
      &lt;property name="dialect"&gt;NHibernate.Dialect.MsSql2008Dialect&lt;/property&gt;
      &lt;property name="connection.provider"&gt;NHibernate.Connection.DriverConnectionProvider&lt;/property&gt;
      &lt;property name="connection.driver_class"&gt;NHibernate.Driver.SqlClientDriver&lt;/property&gt;
      &lt;property name="show_sql"&gt;false&lt;/property&gt;
      &lt;property name="connection.release_mode"&gt;auto&lt;/property&gt;
      &lt;property name="adonet.batch_size"&gt;500&lt;/property&gt;
  
    &lt;/session-factory&gt;
  &lt;/hibernate-configuration&gt;
  </code></pre>