This commit adds a param to the worker pools called facility. This
allows users to choose a different facility/region than the controller
nodes. The default behaviour is to deploy controllers and workers in the
same facility.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

For calico's node ip auto detection use first controller node's private
IP instead of node private CIDR.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

- Mark `node_private_cidr` as deprecated.
- This is added to support multi-facility worker pools. Different
  facility in an EM project can have different private node CIDR, hence
  allow user to provide multiple CIDRs.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>

We use octal of format `0o700` in `lokomotive/pkg/terraform_test`
package. Without this change the tests fail with following error on
go1.16:

```
octal literals requires go1.13 or later (-lang was set to go1.12; check
go.mod)
```

It needs go1.13 or later mentioned in `go.mod`. This commit updates
the go version in `go.mod`.

Signed-off-by: Suraj Deshmukh <suraj@kinvolk.io>