Fixes#7159
When activating extensions in external views, the --ignore-conflicts
option was being ignored. In this particular issue the conflict was
for the duplicate __init__ file for multiple python packages in the
same namespace, but in general any conflict for extensions would
cause an error whether or not --ignore-conflicts was set.
This also renames the 'force' option of do_activate to
'with_dependencies' and updates views to call do_activate with this
set to False (since it traverses the dependency dag anyway). This
isn't strictly required, it just avoids redundant calls.
e3951c2a21