charm build -s centos7 does nothing special?

[fengxia]

Hi Juju,

I made a hello world charm based on charm tutorial, which includes 
layer-basic. I noticed that "charm build" can take a switch "-s series". 
I specified "-s centos7", and diff the result from default built which 
is "trusty". There is no material different between two builds.

Is this expected?

-- 
Feng xia
Engineer
Lenovo USA

Phone: 5088011794
fxia1 at lenovo.com
  	
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