treemanifests: actually strip directory manifests
Stripping has only partly worked since
7cbb3a01fa38 (repair: use cg3
for treemanifests, 2016-01-19): the bundle seems to have been created
correctly, but revlog entries in subdirectory revlogs were not
stripped. This meant that e.g. "hg verify" would fail after stripping
in a tree manifest repo.
To find the revisions to strip, we simply iterate over all directories
in the repo (included in store.datafiles()). This is inefficient for
stripping few commits, but efficient for stripping many commits. To
optimize for stripping few commits, we could instead walk the tree
from the root and find modified subdirectories, just like we do in the
changegroup code. I'm leaving that for another day.
logtoprocess: do not leak the ui object in uisetup
logtoprocess.log should use "self" passed in function arguments instead
of the "ui" object from outside the function.