Use 0.15 release of kvm

stack/kvm.cfg

@@ -108,8 +108,10 @@ location = ${buildout:parts-directory}/${:_buildout_section_name_}
 stop-on-error = true
 #tag = slapos-v0.1
 branch = upstream
+# Use commit which represents 0.15 tag in upstream repository
+commit = ea2798c1ebe0c12d5feb7d7471a999ea0671ef2f
 command =
-  (${git:location}/bin/git clone -b ${:branch} --quiet http://git.erp5.org/repos/slapos.kvm.git ${:location} ) || (rm -fr ${:location} ; exit 1)
+  (${git:location}/bin/git clone -b ${:branch} --quiet http://git.erp5.org/repos/slapos.kvm.git ${:location} && cd ${:location} && ${git:location}/bin/git reset --hard ${:commit}) || (rm -fr ${:location} ; exit 1)
 update-command =
  cd ${:location} && ${git:location}/bin/git pull --quiet origin master