containerized-undercloud: create install/upgrade logs by default

[Emilien Macchi]

Before with instack-undercloud we used to have ~/.instack/install-undercloud.log.

It would be great to have the same feature so our users can loop at the log files out of the box, without having to use commands like tee, etc.

[Emilien Macchi (emilienm)]

David, it would be great to have the logfile in $HOME/install-undercloud.log for example.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/562082

[OpenStack Infra (hudson-openstack)]

Change abandoned by David Peacock (<email address hidden>) on branch: master
Review: https://review.openstack.org/562082
Reason: After discussion with Alex Schultz, this looks like a bigger project.

I'm going to take a new approach capturing output from the subcommand in undercloud.py in a new change, then revisit the bigger logging picture.

[Bogdan Dobrelya (bogdando)]

Addressed by: https://review.openstack.org/#/c/564370/

[Bogdan Dobrelya (bogdando)]

I think the most logical would be to re-use the --log-file param for both install and upgrade logs.
Then users will have less places to look for errors, less CLI/config options for logging, and less changes to SOS-report tooling as well. Seems like a win-win for all.