Fixed failing tests and made changes to the respective automation flows and beans

- Upgraded the connector test version to 2.0.6 in pom.xml

- Fixed IllegalArgumentException in the following test cases by changing the MongoTestParent to use the payloadContent attribute and modifying the tests accordingly:
	- FindOneFileTestCases
	- GetFileContentTestCases
	- GetFileContentUsingQueryMapTestCases
	- ListFilesTestCases
	- ListFilesUsingQueryMapTestCases
	
- Fixed NullPayloadException and ClassCastException in ListCollectionTestCases and PoolingTestCases respectively

- Modified findOneFile automation bean and the respective test FindOneFileTestCases so that the test setup is more accurate

- Added the automation-test-flows.xml back into the project and made the following changes:
	- Removed uncommented text "UNTESTED"
	- Removed duplicate flow "create-collection"
	- Changed flows to acquire data off of flowVars instead of the payload

- Adjusted the automation-credentials.properties file so that it properly includes all the properties required