Feature request: Add additional default agents to the common-shared library

When building products in Java right now, we have a lot of duplication in the Jenkinsfiles WRT the agents that are used in the build. They are the same across our over a dozen offerings, and would be a good candidate to embed into the common library if possible! The 2 agents in question:

Java/Hugo agent:

  agent {
    kubernetes {
      label 'buildenv-agent'
      yaml '''
      apiVersion: v1
      kind: Pod
      spec:
        containers:
        - name: buildcontainer
          image: eclipsefdn/stack-build-agent:latest
          imagePullPolicy: Always
          command:
          - cat
          tty: true
          resources:
            requests:
              cpu: "1"
              memory: "4Gi"
            limits:
              cpu: "2"
              memory: "4Gi"
          env:
          - name: "HOME"
            value: "/home/jenkins"
          - name: "MAVEN_OPTS"
            value: "-Duser.home=/home/jenkins"
          volumeMounts:
          - name: m2-repo
            mountPath: /home/jenkins/.m2/repository
          - name: m2-secret-dir
            mountPath: /home/jenkins/.m2/settings.xml
            subPath: settings.xml
            readOnly: true
          - mountPath: "/home/jenkins/.m2/settings-security.xml"
            name: "m2-secret-dir"
            readOnly: true
            subPath: "settings-security.xml"
          - mountPath: "/home/jenkins/.mavenrc"
            name: "m2-dir"
            readOnly: true
            subPath: ".mavenrc"
          - mountPath: "/home/jenkins/.m2/wrapper"
            name: "m2-wrapper"
            readOnly: false
          - mountPath: "/home/jenkins/.cache"
            name: "yarn-cache"
            readOnly: false
        - name: jnlp
          resources:
            requests:
              memory: "1024Mi"
              cpu: "500m"
            limits:
              memory: "1024Mi"
              cpu: "1000m"
        volumes:
        - name: "m2-dir"
          configMap:
            name: "m2-dir"
        - name: m2-secret-dir
          secret:
            secretName: m2-secret-dir
        - name: m2-repo
          emptyDir: {}
        - name: m2-wrapper
          emptyDir: {}
        - name: yarn-cache
          emptyDir: {}
      '''
    }
  }

Kubernetes agent:

      agent {
        kubernetes {
          label 'kubedeploy-agent'
          yaml '''
          apiVersion: v1
          kind: Pod
          spec:
            containers:
            - name: kubectl
              image: eclipsefdn/kubectl:okd-c1
              command:
              - cat
              tty: true
              resources:
                limits:
                  cpu: 1
                  memory: 1Gi
              volumeMounts:
              - mountPath: "/home/default/.kube"
                name: "dot-kube"
                readOnly: false
            - name: jnlp
              resources:
                limits:
                  cpu: 1
                  memory: 1Gi
            volumes:
            - name: "dot-kube"
              emptyDir: {}
          '''
        }
      }