Resolves the issue of the user not able to add pipelines to the kabanero custom resource file

[oiricaud]

The user was not able to add pipelines to their custom resource upon using the run.sh file.
What caused this issue was that the script was not counting the # of pipelines that currently exist in the kabanero.yaml file.

This pull request resolves that issue by first counting the # of pipelines that exist in the stack key, and incrementing by 1 to add the new pipeline at the bottom.

Given the default kabanero pipelines i.e

    stacks:
      pipelines:
      - https:
          url: https://github.com/kabanero-io/kabanero-pipelines/releases/download/0.6.1/default-kabanero-pipelines.tar.gz
        id: default
        sha256: 64aee2805d36127c2f1e0e5f0fc6fdae5cef19360c1bb506137584f3bd0988cc

where the user wants to add a new pipeline

      - https:
          url: https://github.com/oiricaud/pipelines/releases/download/v60.0/default-kabanero-pipelines.tar.gz
        id: package-release-update-pl
        sha256: 86b1902f9f7ce0911f759bbe9e11c27075a3b1f7cca40de59df19eab9afca45d

The pull request now gives the following results in

    stacks:
      pipelines:
      - https:
          url: https://github.com/kabanero-io/kabanero-pipelines/releases/download/0.6.1/default-kabanero-pipelines.tar.gz
        id: default
        sha256: 64aee2805d36127c2f1e0e5f0fc6fdae5cef19360c1bb506137584f3bd0988cc
      - https:
          url: https://github.com/oiricaud/pipelines/releases/download/v60.0/default-kabanero-pipelines.tar.gz
        id: package-release-update-pl
        sha256: 86b1902f9f7ce0911f759bbe9e11c27075a3b1f7cca40de59df19eab9afca45d

[oiricaud]

Can @hollisc or @andrew-suh do a code review if bandwidth is available.