add syntax check function for yaml namespace

[nobodyiam]

No description provided.

[codecov-io]

Codecov Report

Merging #1946 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #1946      +/-   ##
============================================
- Coverage     50.86%   50.82%   -0.05%     
  Complexity     1979     1979              
============================================
  Files           398      398              
  Lines         12175    12185      +10     
  Branches       1249     1250       +1     
============================================
  Hits           6193     6193              
- Misses         5524     5534      +10     
  Partials        458      458

Impacted Files	Coverage Δ	Complexity Δ
...ework/apollo/portal/controller/ItemController.java	6.32% <0%> (-0.92%)	1 <0> (ø)

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[coveralls]

Coverage decreased (-0.04%) to 54.584% when pulling f545caa on nobodyiam:yml-syntax-check into 41450a5 on ctripcorp:master.