-A $INSTANCE_URL is ignored in a checkout of foreign instance

[adrianschroeter]

Describe the bug
The command line switch -A $URL used to be the authority in any case, independend of local data. This changed in some of the last releases, what can be quite dangerous esp in scripts when operations happen on the wrong instance.

To Reproduce
Steps to reproduce the behavior:

1. osc -A $INSTANCE_A co any_project any_package
2. cd any_project/any_package
3. osc -A $INSTANCE_B search ...

The search result will be from INSTANCE_A. However this is not limited to the search command, but afaik happens with all commands.

Expected behavior
osc -A $URL always uses $URL no matter of local work directory.