CLOUDSTACK-2652: requests module differs on Python 2.6
CLOUDSTACK-2652: requests module differs on Python 2.6

On 2.6 response.json returns the JSOn in the response while on 2.7
response.json() is a method. Since Marvin installs on both platforms
fixing the error appropriately

Signed-off-by: Prasanna Santhanam <82219615980488abd2acc1a3d71cfb58f0b2b8b6@apache.org>

jcshen007/cloudstack,mufaddalq/cloudstack-datera-driver,GabrielBrascher/cloudstack,DaanHoogland/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,resmo/cloudstack,mufaddalq/cloudstack-datera-driver,DaanHoogland/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,jcshen007/cloudstack,wido/cloudstack,jcshen007/cloudstack,DaanHoogland/cloudstack,resmo/cloudstack,DaanHoogland/cloudstack,wido/cloudstack,DaanHoogland/cloudstack,GabrielBrascher/cloudstack,GabrielBrascher/cloudstack,jcshen007/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,mufaddalq/cloudstack-datera-driver,mufaddalq/cloudstack-datera-driver,resmo/cloudstack,resmo/cloudstack,resmo/cloudstack,resmo/cloudstack,wido/cloudstack,wido/cloudstack,wido/cloudstack,GabrielBrascher/cloudstack,mufaddalq/cloudstack-datera-driver,resmo/cloudstack,jcshen007/cloudstack