Adding test for Path traversal security vulnerability in LogViewer Admin service

[Niranjan-K]

Description:
This PR contains the test case for wso2/carbon-commons#216. This is fork from PR : #338

Affected Product Version:
This issue is addressed in the following carbon-commons versions,
4.5.3
4.4.10-SNAPSHOT
4.6.0-SNAPSHOT

Related Issues:
#338
wso2/carbon-commons#216