setdiscovery: don't use dagutil for rev -> node conversions
We don't need to use dagutil to perform a simple rev -> node
conversion.
I haven't measured, but the new code is likely faster, as we
avoid extra function calls and avoid some attribute lookups.
Differential Revision: https://phab.mercurial-scm.org/D4304
$ rm -rf a
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am0
adding a
$ hg tag t1 # 1
$ hg tag --remove t1 # 2
$ hg co 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg tag -f -r0 t1
$ hg tags
tip 3:a49829c4fc11
t1 0:f7b1eb17ad24
$ cd ..