Store the path to the ota file generator where it can be reused

Change-Id: I8896713c79a751b79fbbcc75f6ba30dad4ea9fac
Add f2fs to list of partition types in common.py

Change-Id: I9a54489c38009ca2970132b530164663b15c1337
Merge "Store the path to the ota file generator where it can be reused" into jb3
Merge "Add f2fs to list of partition types in common.py" into jb3