Add API extension for OpenShift specific resources

[manusa]

Generate Java API client and model types for Red Hat OpenShift.

See also:

• https://github.com/openshift/origin
• https://github.com/openshift/kubernetes

[manusa]

Support was added in:

• 22

• https://github.com/manusa/yakc/commit/2e383451230025c01efd8f3b93337827efc5898d
• https://github.com/manusa/yakc/commit/4ae10db39231e96e30838edb1c6e4d9cbb56cffc
• https://github.com/manusa/yakc/commit/67477baae814202f70a2deef9b25a5e794fd3751
• https://github.com/manusa/yakc/commit/c094e23ca37dc5e0241e3b9bb993010f2af624f3