Removed DTAP and Ping Server dependancy from test cases + Support for XFS file system in E2E tests.

Framework Related Changes :
Azure_ICA_ALL.xml
[new] Added DTAP and Ping server deployment definitions to the test setups.
[new] Added "Tag" field to hosted service definition. ("This will help to differentiate between TEST VM and DTAP/EXTERNAL PING VM by adding small tag to hosted service name.")

RDFELibs.psm1
[new] Added support for xfs file system for E2E data disk tests.

All test cases:
[new] Added support for dynamic DTAP and Ping server.
[fix] Corrected all indentaion.