Move bash scripts to python

[Jim Rollenhagen]

We currently have some bash scripts in IPA to write the image, shutdown the machine, etc. These aren't unit testable, and require a bunch of error handling to know where they fail (if they fail). We should move them to python with utils.execute() calls as needed.

[Jim Rollenhagen (jim-rollenhagen)]

We should probably use ironic-lib to replace write_image, and move any agent-specific optimizations into ironic-lib as well.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/372478

[Annie Lezil (annie-lezil)]

Hi Bharath,

Are you still working on this bug. If not, shall I complete it

Annie

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/410486

[OpenStack Infra (hudson-openstack)]

Change abandoned by Annie Lezil (<email address hidden>) on branch: master
Review: https://review.openstack.org/410486
Reason: Sorry I mistakenly uploaded a new patch.

Please review the patch https://review.openstack.org/#/c/372478/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/372478
Committed: https://git.openstack.org/cgit/openstack/ironic-python-agent/commit/?id=9948349b10b6bb694f92813243598a7a7c84d3f8
Submitter: Jenkins
Branch: master

commit 9948349b10b6bb694f92813243598a7a7c84d3f8
Author: Bharath kumar <email address hidden>
Date: Mon Sep 19 12:41:04 2016 +0000

    Moving Reboot bashscript to python

    Currently a reboot bash script file is used to call reboot and
    poweroff operation. Deleting this file and moving the code to
    python file using utils.execute()

    Partial-Bug: #1557542

    Change-Id: Iad9cd9d15417e9a954d108d2759e6303452fca27
    Author: Bharath kumar <email address hidden>
    Co-Authored-By: Annie Lezil <email address hidden>