For some unknown reason, the merged imsi list might contain
duplicated items. Deduplication for better error handling.
Test: make RunSettingsRoboTests
Fix: 271298466
Change-Id: I3cbe8f9441769963a16720fc5128db173fa0868b
Move mobile data template out of framework
Bug: 151751844
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=DataUsageLibTest
Change-Id: I5072cd1e673194d00b3ce82242bf5fbad88d23cd