[packages] tinc: fix init.d/tinc parameter generation and logfile config name

tinc expects long parameters to be in the form "--name=value" and the
current init scripts generate "--name value" parameters. See `tincd
--help` to confirm. Also, the config/tinc and init.d/tinc incorrectly
use the parameter "log" when it should be "logfile".

Signed-off-by: Sandy McArthur, Jr. <Sandy@McArthur.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36508 3c298f89-4303-0410-b956-a3cf2f4a3e73