devel: use the new 'config' argument of the develwarn in deprecwarn
Controling all deprecation warnings with the same config seems sensible. This
mirror a fix (about missing gating) submitted for stable but with the new API.
init repo
$ hg init foo
$ cd foo
ill-formed config
$ hg status
$ echo '=brokenconfig' >> $HGRCPATH
$ hg status
hg: parse error at * (glob)
[255]
alias having an environment variable and set to use pager
$ rm $HGRCPATH
$ cat >> $HGRCPATH <<'EOF'
> [ui]
> formatted = yes
> [extensions]
> pager =
> [pager]
> pager = sed -e 's/^/P/'
> attend = printa
> [alias]
> printa = log -T "$A\n" -r 0
> EOF
$ A=1 hg printa
P1
$ A=2 hg printa
P2