增加实例参数配置模块

[hhyo]

感谢 @yyukai

• MysqlEngine新增server_version、get_variables、set_variable三个方法
• 实例管理新增参数配置模块、目前仅支持MySQL，支持配置参数模板，编辑动态参数，并记录修改历史

MODEL新增两个表

ParamTemplate、ParamHistory

新增三个控制权限

 ('menu_param', '菜单 参数配置'),
 ('param_view', '查看实例参数列表'),
 ('param_edit', '修改实例参数'),

新增依赖
表格编辑 bootstrap-editable

[codecov]

Codecov Report

Merging #115 into master will increase coverage by 0.59%.
The diff coverage is 91.36%.

@@            Coverage Diff             @@
##           master     #115      +/-   ##
==========================================
+ Coverage    72.5%   73.09%   +0.59%     
==========================================
  Files          61       61              
  Lines        6314     6516     +202     
==========================================
+ Hits         4578     4763     +185     
- Misses       1736     1753      +17

Impacted Files	Coverage Δ
sql/urls.py	100% <ø> (ø)	⬆️
sql/sql_tuning.py	95.94% <100%> (-0.16%)	⬇️
sql/engines/inception.py	86.58% <100%> (ø)	⬆️
sql/admin.py	100% <100%> (ø)	⬆️
sql/engines/tests.py	100% <100%> (ø)	⬆️
sql/models.py	95.9% <100%> (+0.28%)	⬆️
sql/tests.py	100% <100%> (ø)	⬆️
sql/views.py	37.86% <40%> (-0.64%)	⬇️
sql/instance.py	45.37% <83.33%> (+16.23%)	⬆️
sql/engines/mysql.py	93.9% <88.23%> (+0.56%)	⬆️

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[LeoQuote]

很强，又加了两个功能