XD-571 Add shell integration tests for named channels
Added test cases for creating named channels as sink/source
Added @After method to destroy streams after each test
Overridden equals and hashCode methods for TableRow for test verification
Updated to use AbstractStreamIntegrationTest

Merge branch 'XD-571' of https://github.com/ilayaperumalg/spring-xd into ilayaperumalg-XD-571-master