CLDCONNECT-1657: Update getUserTimeline operation to include userid or screen name

1. Since the connector already have two dedicated API of getUserTimeline() for user id and screen name, removal of getUserTimeline() without any of user id and screen name is done.
2. Removal of legacy test (which are not test cases though)
3. Updatation of Smoke and Regression Test runners.
4. After merging https://github.com/mulesoft/twitter-connector/pull/16 and then running the Regression suite on this results in all pass.

This relates to https://www.mulesoft.org/jira/browse/CLDCONNECT-1657 and depends on successful merge of this pull request https://github.com/mulesoft/twitter-connector/pull/16 (https://www.mulesoft.org/jira/browse/CLDCONNECT-1643).