feat(upgrade): add basic upgrade framework and cspc upgrades

[shubham14bajpai]

This PR adds

• upgrade framework to upgrade OpenEBS data plane components.
• upgrade support for CSPC.
• vendor files for the repo.
• Makefile and build scripts.

Sample job YAML:

apiVersion: batch/v1
kind: Job
metadata:
  name: cstor-cspc
  #VERIFY the value of namespace is same as the namespace where openebs cstor components
  # are installed. You can verify using the command:
  # `kubectl get pods -n <openebs-namespace> -l openebs.io/component-name=cspc-operator`
  namespace: openebs
spec:
  backoffLimit: 4
  template:
    spec:
      #VERIFY the value of serviceAccountName is pointing to service account
      # created within openebs namespace. Use the non-default account.
      # by running `kubectl get sa -n <openebs-namespace>`
      serviceAccountName: openebs-cstor-operator
      containers:
      - name:  upgrade
        args:
        - "cstor-cspc"

        # --from-version is the current version of the pool
        - "--from-version=1.9.0"

        # --to-version is the version desired upgrade version
        - "--to-version=1.10.0"
        - "--to-version-image-prefix=openebs/"
        - "--to-version-image-tag=ci"

        #VERIFY that you have provided the correct list of CSPC Names
        - "cspc-stripe"

        #Following are optional parameters
        #Log Level
        - "--v=4"
        #DO NOT CHANGE BELOW PARAMETERS
        env:
        - name: OPENEBS_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
        tty: true

        # the image version should be same as the --to-version mentioned above
        # in the args of the job
        image: openebs/upgrade-amd64:ci
        imagePullPolicy: IfNotPresent
      restartPolicy: Never
---

TODO:

• move code for deployment rollout status from openebs/maya to either openebs/api or this repo.
• add examples for upgrade job YAMLs.

[prateekpandey14]

lgtm