Bump MAX_VERSION to 3.70 to support the following:
- 3.69 - Allow null value for shared_targets
- 3.70 - Support encrypted volume transfers
Implements: bp/transfer-encrypted-volume
Depends-On: I459f06504e90025c9c0b539981d3d56a2a9394c7
Change-Id: I11072d6d8a185037c7f4cdd52c45933b0cccaf05