New version of api-generator tool

The new version produces api-versions.xml file with API removal
information. The format of the file is backward compatible.

Test: api-generator was tested as part of ag/2298689
Bug: 37127307
Change-Id: I0db84363b973a2c6076dcb42033a09a5566ff9f1
(cherry picked from commit 1c6c8929)
(cherry picked from commit a9bb8f2687f7c879be8b2bacf420e6e116ca245b)