renamed all xsd files from v2_6_0 to v2_7_0

v2_7_0/CDT-AE-v2_7_0.xsd

v2_7_0/CDT-CSEBase-v2_7_0.xsd

v2_7_0/CDT-accessControlPolicy-v2_7_0.xsd

v2_7_0/CDT-activeCmdhPolicy-v2_7_0.xsd

v2_7_0/CDT-areaNwkDeviceInfo-v2_7_0.xsd

v2_7_0/CDT-areaNwkInfo-v2_7_0.xsd

v2_7_0/CDT-battery-v2_7_0.xsd

v2_7_0/CDT-cmdhBuffer-v2_7_0.xsd

v2_7_0/CDT-cmdhDefEcValue-v2_7_0.xsd

v2_7_0/CDT-cmdhDefaults-v2_7_0.xsd

v2_7_0/CDT-cmdhEcDefParamValues-v2_7_0.xsd

v2_7_0/CDT-cmdhLimits-v2_7_0.xsd

v2_7_0/CDT-cmdhNetworkAccessRules-v2_7_0.xsd

v2_7_0/CDT-cmdhNwAccessRule-v2_7_0.xsd

v2_7_0/CDT-cmdhPolicy-v2_7_0.xsd

v2_7_0/CDT-commonTypes-v2_7_0.xsd

v2_7_0/CDT-container-v2_7_0.xsd

v2_7_0/CDT-contentInstance-v2_7_0.xsd

v2_7_0/CDT-delivery-v2_7_0.xsd

v2_7_0/CDT-deviceCapability-v2_7_0.xsd