Eqlx: Equallogic CI not retrying on network connection errors

[Rajini Karthik]

Cinder's Equallogic driver fails to create any volumes on ssh connection errors.

Error thrown: SSHException: Error connecting via ssh: [Errno 101] ENETUNREACH

Retries don’t happen when there is a processutils.ProcessExecutionError thrown
and in this case it is this error

The eqlx_cli_max_retries is the number of retry attempts and works only for volumebackendapiexception.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/171736

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/171736
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=576c368f1c57ad4b9ae51268a48ac53c65e794aa
Submitter: Jenkins
Branch: master

commit 576c368f1c57ad4b9ae51268a48ac53c65e794aa
Author: rajinir <email address hidden>
Date: Tue Apr 28 11:28:51 2015 -0500

    Eqlx: Fixes the retries on Network Connection Error

    Volume creations were failing due to ssh connection
    errors throwing ProcessExecutionError
    and retries were not happening. Made a fix
    to retry commands on both network errors and
    backend api exceptions.
    The parameter eqlx_cli_max_retries determines
    the number of retry attempts made.

    Closes Bug: #1441719
    Change-Id: I54b76afc6c9c5d51dd9c38831ee0a1c731c7b161