Replace lresolve with resolve(..., follow=False)

Replace lresolve with resolve(..., follow=False)

Although there's the NOFOLLOW precedent, this is really just to narrow
the API before we add it as a repo method, i.e. so we only have to
handle one function instead of two.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>
Tested-by: Rob Browning <rlb@defaultvalue.org>