Eliminated the limitation on the number of options that can be pushed

Eliminated the limitation on the number of options that can be pushed
to clients, including routes.  Previously, all pushed options needed
to fit within a 1024 byte options string.

Remember that to make use of this feature to allow many routes to
be pushed to clients, the client config file must specify the
max-routes option, and the number of pushed routes cannot exceed
this limit.  Also, both server and client must include this commit.

git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@4991 e7ae566f-a301-0410-adde-c780ea21d3b5