Remove TRACK_DEPENDS

This was added in 2012 with I89677fd54635e82b10ab674ddeb9ffb3f1a755f0,
but I can not see it being used anywhere currently.

It's use of virtualenv's has become problematic in a python2
deprecated world, but since it is not used, remove it to avoid further
confusion.

Change-Id: I65d44d24f449436ca6229928eee2c5a021793055
3 files changed