Update defaultComponents in CheCluster to support user namespaces

[cgruver]

"defaultComponents": [
                        {
                            "attributes": {
                                "container-overrides": {
                                    "securityContext": {
                                        "procMount": "Unmasked"
                                    }
                                },
                                "pod-overrides": {
                                    "metadata": {
                                        "annotations": {
                                            "io.kubernetes.cri-o.Devices": "/dev/fuse,/dev/net/tun"
                                        }
                                    },
                                    "spec": {
                                        "hostUsers": false
                                    }
                                }
                            },
                            "container": {
                                "image": "quay.io/cgruver0/che/dev-tools:latest",
                                "memoryLimit": "6Gi",
                                "mountSources": true,
                                "sourceMapping": "/projects"
                            },
                            "name": "dev-tools"
                        }
                    ],