Added better REST client impl
Added better REST client impl

cloudfoundry-incubator/bosh-azure-cpi-release,AbelHu/bosh-azure-cpi-release,bingosummer/bosh-azure-cpi-release,cloudfoundry-incubator/bosh-azure-cpi-release,gossion/bosh-azure-cpi-release,cloudfoundry-incubator/bosh-azure-cpi-release,ritazh/bosh-azure-cpi-release,gossion/bosh-azure-cpi-release,AbelHu/bosh-azure-cpi-release,AbelHu/bosh-azure-cpi-release,ritazh/bosh-azure-cpi-release,bingosummer/bosh-azure-cpi-release,gossion/bosh-azure-cpi-release,ritazh/bosh-azure-cpi-release,bingosummer/bosh-azure-cpi-release