MFH: r497782

net/xrdp: backport some upstream patches

Upcoming next v0.9.10 includes all of following changes. To apply some
important patches to quarterly packages, pick some patches up and apply.

• Fix typo in man page [1]
• Fix the issue session doesn't start properly after sesman got SIGUP [2]
• Shutdown xrdp daemon more responsively [3]

[1] https://github.com/neutrinolabs/xrdp/commit/46b4a9b7c8ae555b2dc3e2a1c2ab42717aa315d4
[2] https://github.com/neutrinolabs/xrdp/commit/81703c426f8498022c28a231df7d88ca28bfa842
[3] https://github.com/neutrinolabs/xrdp/commit/0ed82f71e8b3208d12f164ea8900195cd868032e

Approved by: portmgr (miwi)