Confluence: Prepare dedicated module (#1537)

* Confluence: Prepare dedicated module

Author: gonchik

atlassian/confluence.py renamed to atlassian/confluence/__init___.py

@@ -13,16 +13,15 @@
 from requests import HTTPError
 
 from atlassian import utils
-
-from .errors import (
+from atlassian.errors import (
     ApiConflictError,
     ApiError,
     ApiNotAcceptable,
     ApiNotFoundError,
     ApiPermissionError,
     ApiValueError,
 )
-from .rest_client import AtlassianRestAPI
+from atlassian.rest_client import AtlassianRestAPI
 
 log = logging.getLogger(__name__)