DragonFlyBSD

Matt,

I'd like to bring in a /sbin/mount_nfs option "-o retrycnt=" from FreeBSD.

DragonFly's mount_nfs has -R which is the same as -o retrycount,
but automountd (userspace daemon of autofs port from FreeBSD) needs this.

Using non -o options requires userspace rewrite as the config file parser for automountd assumes mount options are passed via -o.

The parser part of automountd is 100% userspace stuff which means the code is basically 100% compatible with FreeBSD,
so adding this alias to mount_nfs makes more sense than touching the parser only to support non -o format.

https://leaf.dragonflybsd.org/~tkusumi/diff/0001-sbin-mount_nfs-Add-o-retrycnt-from-FreeBSD.patch