Add error message to build description

Change-Id: Ifffce007fbe9d3bc47ea57c30ee652b5e0bdb680
diff --git a/openstack-compute-install.groovy b/openstack-compute-install.groovy
index 8e53396..d09dc44 100644
--- a/openstack-compute-install.groovy
+++ b/openstack-compute-install.groovy
@@ -86,6 +86,7 @@
     } catch (Throwable e) {
         // If there was an error or exception thrown, the build failed
         currentBuild.result = "FAILURE"
+        currentBuild.description = e.message
         throw e
     }
 }