API: fencer: Don't automatically pass nodeid as parameter

...for fence devices whose agent metadata advertises support for a
nodeid parameter.

No known fence agent advertises the nodeid parameter in its metadata, so
is_nodeid_required() should never return true unless some custom fence
agent advertises nodeid and expects Pacemaker to pass it automatically.

If anyone complains about this, we can deprecate this functionality for
a while and drop it at a major or minor release. However, it seems
likely this has been unused for a long time.

It was added by c2265a12 in 2012. The commit message gives no
information about what motivated the change, and there is no linked pull
request or bug that might include discussion. I guess some legacy fence
agent supported a nodeid parameter, but I have no way to find out.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>