Refactor module structure

Move mysqltasks to top level to keep the task names when using Python3.

gvamysql/setup.cfg

@@ -0,0 +1,18 @@
+[coverage:run]
+source = gvacommon,mysqltasks
+branch = True
+omit = */tests/*.py,*/tests.py
+relative_files = True
+
+[coverage:report]
+show_missing = True
+
+[coverage:html]
+directory = ../coverage-report
+
+[isort]
+multi_line_output = 3
+line_length = 88
+known_third_party = celery,MySQLdb
+include_trailing_comma = True
+sections = FUTURE,STDLIB,THIRDPARTY,FIRSTPARTY,LOCALFOLDER