fix erroring on dot-prefixed pod files

[bverschueren]

This fixes:

$ omc get pods -n openshift-ingress
error: namespace openshift-ingress not found.

In MG's with "AppleDouble encoded Macintosh file" dot-prefixed files, e.g:

$ tree -a <mg-root>/namespaces/openshift-ingress/pods/
<mg-root>/namespaces/openshift-ingress/pods/
├── ._router-default-xxx-yyy
├── router-default-xxx-yyy
│   ├── ._router
│   ├── router
│   │   ├── ._router
│   │   └── router
│   │       ├── ._logs
│   │       └── logs
│   │           ├── ._current.log
│   │           ├── current.log
│   │           ├── ._previous.insecure.log
│   │           ├── previous.insecure.log
│   │           ├── ._previous.log
│   │           └── previous.log
│   ├── ._router-default-xxx-yyy.yaml
│   └── router-default-xxx-yyy.yaml
├── ._router-default-aaa-bbb
└── router-default-aaa-bbb
    ├── ._router
    ├── router
    │   ├── ._router
    │   └── router
    │       ├── ._logs
    │       └── logs
    │           ├── ._current.log
    │           ├── current.log
    │           ├── ._previous.insecure.log
    │           ├── previous.insecure.log
    │           ├── ._previous.log
    │           └── previous.log
    ├── ._router-default-aaa-bbb.yaml
    └── router-default-aaa-bbb.yaml