net/syncthing: update to 0.10.9

While here, also:

- Move metadata dir to /var/db/syncthing
- Minor improvements to rc script

PR:		195541
Submitted by:	Joshua Ruehlig <joshruehlig@gmail.com>


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@373700 35697150-7ecd-e111-bb59-0022644237b5
net/syncthing-discosrv: update for new syncthing version


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@373701 35697150-7ecd-e111-bb59-0022644237b5