Rename ANS to ONS

Rename AlternativeNetworkService to OpportunisticNetworkService
Bug: 118347827
Test: compile

Merged-In: Ifbbc5eccd35c4b0c2c4e60a04425f4aea0fdeafd
Change-Id: Ifbbc5eccd35c4b0c2c4e60a04425f4aea0fdeafd
3 files changed