* Changes to testDatasource interface method and archive flow
* Tests for plugin level testDatasource implementations
* Added test for refreshing cache on deleting datasource
* Modified warnings to errors in logs
* Fixed test
* Fixed test
* ArangoDB has two types of command - one that fetches a response and the other that updates a document. Currently, ArangoDB plugin treats all cmds like the one that returns a response, hence when update cmds are run then an empty response is returned to the client since there is nothing to fetch. This PR adds a check to fetch the response based on the type of cmd. Hence, for an update cmd the number of writes succeeded or failed would be returned as a response.
* Added field to autogenerate values in DB column
* Added comment and refactor
* Autogenerate field update according to names instead of type for ArangoDB
