The first step in the code cleanup for removing the API V3 references
is to move the existing default V2 code into a directory named
'legacy_v2'. This moves the files, and updates all references to
them. This is the first in a patch series of discreet changes to the
codebase structure.
Partial-Bug: #1462901
Change-Id: Ic19f2d019c2c78f1de14a0eced85e84f2d2cec28