fix(Tree): Still can check after disableChecked

[myronliu347]

fixed #872

[codecov]

Codecov Report

Merging #925 into master will decrease coverage by 0.02%.
The diff coverage is 95.69%.

@@            Coverage Diff            @@
##           master    #925      +/-   ##
=========================================
- Coverage   91.43%   91.4%   -0.03%     
=========================================
  Files         245     245              
  Lines       14167   14221      +54     
  Branches     4449    4487      +38     
=========================================
+ Hits        12953   12999      +46     
- Misses       1195    1203       +8     
  Partials       19      19

Impacted Files	Coverage Δ
src/tree-select/tree-select.jsx	93.44% <100%> (ø)	⬆️
src/tree/view/util.js	94.17% <94.82%> (-4.63%)	⬇️
src/tree/view/tree.jsx	90.8% <96.96%> (ø)	⬆️
src/cascader-select/cascader-select.jsx	89.04% <0%> (-0.27%)	⬇️
src/upload/dragger.jsx	100% <0%> (ø)	⬆️
src/upload/upload.jsx	82.23% <0%> (+0.11%)	⬆️
src/field/index.js	93.94% <0%> (+0.13%)	⬆️

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[youluna]

除了 #872 之外好像还有父节点控制了disabled的子节点等的问题，把解决的问题都写清楚吧，后续好跟踪

另外改动比较大，建议放到Y位

[youluna]

还差 childChecked 函数的抽离，另外这个放到1.17.0是不是更合适