ENH: use of echo at connection, and new cursor with echo option from …

[rspadim]

…connection

What do these changes do?

Include logger.debug() message at _execute() connection function

Are there changes in behavior for the user?

yes, when connection echo = True, will log more messages, instead of only cursor echo messages, but it's much much more usefull since we can trace autocommit , commit, begin, rollback messages, this helps a lot when debuging deadlocks

Related issue number

#498

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.