Functional test: function name should not contain the test name

[kannappanr]

Function name should not contain the test name. It should contain the API that was intended to be tested.

{"name":"Minio.Net","function":"BucketExists_Test","duration":817,"status":"PASS","alert":"","message":"","error":""}

BucketExists_Test should not be the value of the function field. It should be something like Task<bool> BucketExistsAsync(string bucketName, CancellationToken cancellationToken = default(CancellationToken)