Removed use of OpenUDID and removed the use of headers in the ApigeeiOSSDK-Prefix.pch file.

Due to the removal of the OpenUDID code, the ApigeeMonitoringClient's apigeeDeviceId is now the same value as the ApigeeDataClient's getUniqueDeviceID. This makes sense seeing as though 2 values for those are ambiguous and cause confusion anyways.

The Prefix.pch file was updated because it is not recommended for what we are using it for.