add rate limit control for no config warning

[nobodyiam]

No description provided.

[coveralls]

Coverage decreased (-0.04%) to 50.24% when pulling 328eac8 on nobodyiam:reduce-client-dup-log into dc3c2ba on ctripcorp:master.

[codecov-io]

Codecov Report

Merging #674 into master will decrease coverage by 0.03%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master     #674      +/-   ##
============================================
- Coverage     46.83%   46.79%   -0.04%     
  Complexity     1480     1480              
============================================
  Files           341      341              
  Lines          9388     9389       +1     
  Branches        925      925              
============================================
- Hits           4397     4394       -3     
- Misses         4668     4672       +4     
  Partials        323      323

Impacted Files	Coverage Δ	Complexity Δ
...trip/framework/apollo/internals/DefaultConfig.java	73.49% <66.66%> (-0.9%)	22 <0> (ø)
...work/apollo/biz/message/DatabaseMessageSender.java	44.68% <0%> (-6.39%)	6% <0%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update dc3c2ba...328eac8. Read the comment docs.