Hi Konstantin,
Rename the .war file to a .jar file and it will be picked up by the OSGi web layer. The OSGi Webapp Specification doesn't mandate a particular file extension and in AS7/OSGi Web Application Bundles (WABs) need to have the OSGi bundle extension .jar.
For a working example of a OSGi WebApp deployment see this thread:
http://community.jboss.org/message/616647#616647
Also don't forget to set the start level to 3, using:
<property name="org.osgi.framework.startlevel.beginning">3</property>
this is needed because osgi web support is configured to become available from start level 3...