Description of problem:
when creating medium size app with jenkins client enabled, jenkins will use small builder size by default, and will cause jenkins push build hang there.

Version-Release number of selected component (if applicable):
rhc-cartridge-jenkins-client-1.4-0.22.2-1.el6_2.noarch

How reproducible:
always

Steps to Reproduce:
1.set instance profile to medium
2.create an app with medium size and jenkins enabled
#rhc app create -a testapp -t perl-5.10 -g medium --enable-jenkins
3.go to jenkins console check the default builder size for this app
  
Actual results:
the builder size for the medium size app is 'small', and will cause jenkins push build hang there since the app gear size is medium.

Expected results:
the builder size should be the same as the app gear size.

Additional info:
for the jbossas app, the jenkins builder size will be 'medium' by default.