Fix typo of ANS1 to ASN1

Replace all occurrences of 'ANS1|ans1' with 'ASN1|asn1'.  Keep
cms.is_ans1_token() around for backwards compatibility.

Change-Id: I89da78b89aa9daf2637754dc93031d7ca81e85cb
Closes-bug: 1306874
Merge "Fix typo of ANS1 to ASN1"
Test commit