Enable HandlerInterceptoTest case after fixing issues in it

[isudana]

Description:
This issue is originally reported by Thushitha Dayaratne at https://wso2.org/jira/projects/WMS/issues/WMS-82

Looks like this test case is disabled with following PR.
413cf0b

Related Issues:
https://wso2.org/jira/browse/WMS-82