subrepo: make "_sanitize()" work "_sanitize()" was introduced by 224e96078708 on "stable" branch, but it has done nothing for sanitizing since 224e96078708. "_sanitize()" assumes "Visitor" design pattern: "os.walk()" should invoke specified function ("v" in this case) for each directory elements under specified path but "os.walk()" assumes "Iterator" design pattern: callers of it should drive loop to scan each directory elements under specified path by themselves with the returned generator object Because of this mismatching, "_sanitize()" just discards the generator object returned by "os.walk()" and does nothing for sanitizing. This patch makes "_sanitize()" work. This patch also changes the format of warning message to show each unlinked files, for multiple appearances of "potentially hostile .hg/hgrc".

vfs: add lexists() in current api lexists is added in current API of vfs.

bundlerepo: update unlink in getremotechanges to use vfs As per WindowsUTF8 plan, unlink from getremotechanges is updated to use vfs in this change.

docker: update package target to packages/

packaging: move output directory from build/ to packages/ setuptools owns build/ and dist/ and we want to have our own scheme

make: add a basic osx mpkg target