Logging stops during merge/finish phase of import

[Mathieu Gagné]

When importing a new upstream branch, git-upstream stops logging right before the merge/finish phase start.

This is caused by git-upstream invoking itself and not preserving the original logging options.

The faulty code can be found here:
https://github.com/openstack/git-upstream/blob/c195b69c6b31da085bc45dfa410fdfdd092be901/git_upstream/commands/import.py#L184-L192

In fact, I think regression was introduced by this change which was merged 4 days ago:
https://review.openstack.org/#/c/276237/

[Darragh Bailey (dbailey-k)]

Seems pretty critical to ensure that the original logging options are included if we want to debug what happens during a subsequently called finish phase.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/378567

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/378567
Committed: https://git.openstack.org/cgit/openstack/git-upstream/commit/?id=d8bb479880a453025378d620e77bd8b43b8514f8
Submitter: Jenkins
Branch: master

commit d8bb479880a453025378d620e77bd8b43b8514f8
Author: Darragh Bailey <email address hidden>
Date: Wed Sep 28 13:14:03 2016 +0100

    Ensure parent options retained for exec'ed finish

    Retrieve parent parser arguments set by user, and ensure they are made
    available as part of the default script cmdline. This allows the
    logging from the exec'ed finish command called as the last step by
    git-rebase to log to the same file automatically.

    Change-Id: Ia79a54afe8ace7ade2aa5a29ad16855c9883bd54
    Closes-Bug: #1625864