Bugfix Legacy IP split include/exclude routes for Pulse

Bugfix Legacy IP split include/exclude routes for Pulse

In 3d845bc9b, routing configuration was modified to use the `new_ip_info`
and `install_vpn_opts()`.  Pulse IPv6 split include/exclude handling were
modified accordingly in that commit, but Legacy IP split include/exclude
routes were overlooked.

Since `install_vpn_opts()` clobbers the split include/exclude routes, this
means Legacy IP split routes for Pulse have been ignored since then.

Closes https://gitlab.com/openconnect/openconnect/-/merge_requests/330

Signed-off-by: David Overton <therealdave32@gmail.com>
Signed-off-by: Daniel Lenski <dlenski@gmail.com>