* Remove xunit dependency from testdriver
* swap expected/actual as needed
* Convert Test.Common to nunit
* port hosting unit tests to nunit
* port batchparser integration tests to nunit
* port testdriver.tests to nunit
* fix target to copy dependency
* port servicelayer unittests to nunit
* more unit test fixes
* port integration tests to nunit
* fix test method type
* try using latest windows build for PRs
* reduce test memory use
* Initial non-refactored SQL Agent alert classes (WIP)
* Move agent classes into subdirectories
* Refactor the agent config code a bit more
* Add more implementation for handlers
* Add more code to the create alert handler
* Clean up agent alert class
* Clean up alert methods a bit
* Initial Operator contracts
* Additonal SQL Agent config changes
* More Proxy config cleanup
* Cleanup AgentProxy class
* Additional cleanups
* Run SRGen
* Add security service to create credential objects
