tests/test-resolve.out

localrepo/branchcache: kill unused localrepo.branchcache

The UTF-8 version of the branchcache is the master, always up-to-date, we can
rename it to localrepo._branchcache.

adding file
% create a second head
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
% failing merge
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
use 'hg resolve' to retry unresolved file merges or 'hg update -C' to abandon
% resolve -l, should be empty