Delete backup files

v3_28_0/CDT-AE-v3_28_0.xsd.bu

v3_28_0/CDT-AEContactList-v3_28_0.xsd.bu

v3_28_0/CDT-AEContactListPerCSE-v3_28_0.xsd.bu

v3_28_0/CDT-CSEBase-v3_28_0.xsd.bu

v3_28_0/CDT-accessControlPolicy-v3_28_0.xsd.bu

v3_28_0/CDT-activeCmdhPolicy-v3_28_0.xsd.bu

v3_28_0/CDT-allJoynApp-v3_28_0.xsd.bu

v3_28_0/CDT-allJoynInterface-v3_28_0.xsd.bu

v3_28_0/CDT-allJoynMethod-v3_28_0.xsd.bu

v3_28_0/CDT-allJoynMethodCall-v3_28_0.xsd.bu

v3_28_0/CDT-allJoynProperty-v3_28_0.xsd.bu

v3_28_0/CDT-allJoynSvcObject-v3_28_0.xsd.bu

v3_28_0/CDT-areaNwkDeviceInfo-v3_28_0.xsd.bu

v3_28_0/CDT-areaNwkInfo-v3_28_0.xsd.bu

v3_28_0/CDT-authorizationDecision-v3_28_0.xsd.bu

v3_28_0/CDT-authorizationInformation-v3_28_0.xsd.bu

v3_28_0/CDT-authorizationPolicy-v3_28_0.xsd.bu

v3_28_0/CDT-backgroundDataTransfer-v3_28_0.xsd.bu

v3_28_0/CDT-battery-v3_28_0.xsd.bu

v3_28_0/CDT-cmdhBuffer-v3_28_0.xsd.bu