SLING-3155 - define run modes for this module

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1535044 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/test/config/sling.properties b/src/test/config/sling.properties
index ca68355..588caa3 100644
--- a/src/test/config/sling.properties
+++ b/src/test/config/sling.properties
@@ -15,4 +15,8 @@
 # specific language governing permissions and limitations
 # under the License.
 sling.system.packages.class.com.vladium.emma.rt.RT=com.vladium.emma.rt
-org.apache.sling.commons.log.julenabled=true
\ No newline at end of file
+org.apache.sling.commons.log.julenabled=true
+
+# jackrabbit and oak run modes are mutually exclusive,
+# and cannot be changed after the first startup
+sling.run.mode.install.options=jackrabbit,oak