invalid exceptions used in start_shellinabox_console

[Ruby Loo]

in ironic.drivers.modules.console_utils.start_shellinabox_console(), these exceptions are used:

    exception.ProcessExecutionError, exception.UnknownArgumentError

but they don't exist and would result in a runtime error. They should be processutils.ProcessExecutionError & processutils.UnknownArgumentError.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/113939

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/113939
Committed: https://git.openstack.org/cgit/openstack/ironic/commit/?id=1b526e1f4836327350a97b4a9569b2f4a2a6f6c9
Submitter: Jenkins
Branch: master

commit 1b526e1f4836327350a97b4a9569b2f4a2a6f6c9
Author: Ruby Loo <email address hidden>
Date: Wed Aug 13 15:38:30 2014 +0000

    Use valid exception in start_shellinabox_console

    Replace non-existing exception exception.ProcessExecutionError
    with the correct exception from processutils.

    Remove non-existing exception exception.UnknownArgumentError
    because it was meant to be processutils.UnknownArgumentError
    which isn't needed since it is only raised if there are
    unknown arguments in kwargs, which there aren't in this case
    (only 'check_exit_code' is there.)

    Adds a unit test that checks for the ProcessExecutionError
    exception.

    Change-Id: I756f78bd8d8976a638169ee9db712a95dc664b58
    Closes-Bug: #1356408