Add node as instance attribute for notification

Fix bug 1181900

In havana release, node is not set as instance attribute and node
indicates the hypervisor where the instance reside in, we should
set node as instance attribute for notification.

Change-Id: I872fba626ef3e321d88cf60fc730df6cf4612c86
Fix colorizier thowing exception when a test fails

This failure in colorizier was hidding the actual error
in the tests. If we ran enough tests it also became difficult
to see which test had actually failed.

Fixes: bug 1183602

Change-Id: I806da8f13040b38258de7f3e0fa7b62700bdcead
Merge "Fix colorizier thowing exception when a test fails"
Merge "Add node as instance attribute for notification"