[EAGLE-1016] fix keyword "group" conflict in JDBC storage

https://issues.apache.org/jira/browse/EAGLE-1016

If you meet the same issue after applying this patch, please drop the old table first.

Author: Zhao, Qingwen <qingwzhao@apache.org>

Closes #933 from qingwen220/EAGLE-1016.
13 files changed