新增后台测试登录的功能

[lanrenwo]

RT，详情如下：
1、新增测试登录功能(支持Radius、LDAP)
2、新增“用户对象类”配置项，解决 #179 的问题
3、优化前端监控图表的报错逻辑，401时不报错，避免出现图3的问题

[codecov-commenter]

Codecov Report

Base: 21.00% // Head: 20.41% // Decreases project coverage by -0.59% ⚠️

Coverage data is based on head (ef314c8) compared to base (710cfe4).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #216      +/-   ##
==========================================
- Coverage   21.00%   20.41%   -0.60%     
==========================================
  Files          60       60              
  Lines        3694     3738      +44     
==========================================
- Hits          776      763      -13     
- Misses       2796     2854      +58     
+ Partials      122      121       -1     

Impacted Files	Coverage Δ
server/admin/api_group.go	0.00% <0.00%> (ø)
server/admin/server.go	0.00% <0.00%> (ø)
server/dbdata/group.go	49.31% <0.00%> (-4.02%)	⬇️
server/dbdata/userauth_ldap.go	17.64% <0.00%> (-0.73%)	⬇️
server/sessdata/ip_pool.go	50.43% <0.00%> (-15.93%)	⬇️

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