db:mysqldb: introduce two new methods.

1) ifTableExist() returns if a table does exist.
2) createTableTemplate() creates a table using templates.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
dataMgr: introduce data manager subsystem.

Add two importers.
1) importer.py contains 'Import' class which is proposed to be the
   super class for all child Importers.
2) Introduce whImporter to support WenHua format data records.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
test: add test for dataMgr/importers.

Add test because introduced new dataMgr subsystem.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
strategy:turt1: fix __exit_ issue.

Calling turtle's __exit__ to make sure father's attributes handled.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
Merge branch 'winf-dev' into zhengwang-dev