新增radius认证方式

[lanrenwo]

1、用户组窗口，增加一个选项卡“认证方式” 2、认证方式采用json格式存储，方便未来扩展。

[codecov-commenter]

Codecov Report

Merging #102 (c38f1e9) into dev (7a92aa8) will increase coverage by 0.09%. The diff coverage is 19.60%.

@@            Coverage Diff             @@
##              dev     #102      +/-   ##
==========================================
+ Coverage   17.16%   17.26%   +0.09%     
==========================================
  Files          47       47              
  Lines        2447     2549     +102     
==========================================
+ Hits          420      440      +20     
- Misses       1967     2044      +77     
- Partials       60       65       +5     

Impacted Files	Coverage Δ
server/admin/api_group.go	0.00% <0.00%> (ø)
server/handler/link_auth.go	0.00% <ø> (ø)
server/handler/link_tunnel.go	1.58% <0.00%> (-0.20%)	:arrow_down:
server/handler/server.go	0.00% <ø> (ø)
server/dbdata/user.go	47.11% <16.66%> (-16.12%)	:arrow_down:
server/dbdata/group.go	41.52% <28.00%> (-9.95%)	:arrow_down:

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