Refactor bluemix.net to cloud.ibm.com
Refactor bluemix.net to cloud.ibm.com

https://github.ibm.com/bluemix-mobile-services/bmd-project-push/issues/3777

ibm-bluemix-mobile-services/bms-pushnotifications-serversdk-swift,ibm-bluemix-mobile-services/bms-pushnotifications-serversdk-swift,ibm-bluemix-mobile-services/bluemix-pushnotifications-swift-sdk,ibm-bluemix-mobile-services/bluemix-pushnotifications-swift-sdk