types (networkfs_types) with a version that includes the original
list.
This increases the scope for user error and also means that systems with
networkfs_types set in /etc/rc.conf will not benefit from changes to the
list in /etc/defaults/rc.conf on upgrade.
Instead, store the default list in /etc/rc itself and allow the operator
to append to that list by specifying her own list in networkfs_types.
Rename networkfs_types to extra_netfs_types accordingly, as the new name
better describes the purpose of the variable. Default the value to
'NO'.
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