migrate bootstraper from glide to dep

[lluunn]

I am hitting some error when building locally with glide install -v
Masterminds/glide#975

I will try to migrate to dep.
Other kubeflow repos also use dep kubeflow/training-operator#556

cc @kunmingg

[lluunn]

My dep init never finished.
similar to golang/dep#1991

[r2d4]

/assign @r2d4

[kunmingg]

@r2d4
One dependency we have on glide.lock file:
https://github.com/kubeflow/kubeflow/blob/master/bootstrap/Makefile#L22

[r2d4]

The dockerfiles look like they will need to change also

[kunmingg]

Yeah can instead generate name from hash(Gopkg.lock)

[r2d4]

/unassign @r2d4

[kunmingg]

Now we use go modules