Remove a warning when $HOME is on NFS

If ~/.subversion doesn't exist, the code didn't run, but if it existed
there is no reason to re-create it, nor is it necessary to change its
permissions since they are inherited by the bind mount source.
However user_mkdir was trying to run chown as root which does not work
over NFS with root_squash or krb-nfs.
Therefore, the un-needed call to user_mkdir is removed.
(this is an issue because cros_sdk  --replace does call this code path
multiple times).

BUG=None
TEST=Built the chroot, and the permission denied on 'install' went away.
Change-Id: I01e9a7baf51a99a96d790c9613e26e652379e6df
Reviewed-on: https://gerrit.chromium.org/gerrit/44880
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Marc MERLIN <merlin@chromium.org>
Tested-by: Marc MERLIN <merlin@chromium.org>
2 files changed