all: merge branch 'max-routes-option'

Add support for max-routes option, although this option is already
deprecated for upcoming 2.4 release [1]. But it seems 2.4 release
takes a very long time to materialize, so lets add support for this
option as of today everybody still uses 2.3 or older.

[1] https://github.com/OpenVPN/openvpn/commit/d0085293e709c8a722356cfa68ad74c962aef9a2

https://bugzilla.gnome.org/show_bug.cgi?id=720097