Single node cluster (snc) scripts for openshift-4

How to use?

Make sure the one time setup is satisfied. (https://github.com/openshift/installer/blob/master/docs/dev/libvirt/README.md#one-time-setup) In the snc case, the NetworkManager DNS overlay file at /etc/NetworkManager/dnsmasq.d/openshift.conf should contain:
```
server=/crc.testing/192.168.126.1
address=/apps-crc.testing/192.168.126.11
```
Build the installer using the libvirt tag. ( https://github.com/openshift/installer/blob/master/docs/dev/libvirt/README.md#build-and-run-the-installer )
If you want to build the installer for an official OpenShift release, you should also set RELEASE_IMAGE when building the installer:
```
RELEASE_IMAGE=quay.io/openshift-release-dev/ocp-release:4.1.0-rc.1 TAGS=libvirt hack/build.sh
```
Clone this repo git clone https://github.com/code-ready/snc.git
cp <built_installer_binary> <directory_to_cloned_repo>
cd <directory_to_cloned_repo>
./snc.sh

Once your snc.sh script run successfully.
You need to wait for around 24 hours for initial cert rotation for kubelet server/client.
- https://bugzilla.redhat.com/show_bug.cgi?id=1693951
./createdisk.sh crc-tmp-install-data

Name		Name	Last commit message	Last commit date
Latest commit History 83 Commits
99_master-kubelet-no-taint.yaml		99_master-kubelet-no-taint.yaml
README.md		README.md
crc-bundle-info.json.sample		crc-bundle-info.json.sample
crc_libvirt.template		crc_libvirt.template
createdisk.sh		createdisk.sh
install-config.yaml		install-config.yaml
snc.sh		snc.sh