sslutil: move sslkwargs logic into internal function (API)
As the previous commit documented, sslkwargs() doesn't add any
value since its return is treated as a black box and proxied
to wrapsocket().
We formalize its uselessness by moving its logic into a
new, internal function and make sslkwargs() return an empty
dict.
The certificate arguments that sslkwargs specified have been
removed from wrapsocket() because they should no longer be
set.
$ 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 ..