security/softether{,-devel}: do not spit out anything on libexec directory

SoftEther client, bridge, server daemon unintendedly had spit on libexec
directory up to this update. Spit out all runtime files, directories and
logs on SE_DBDIR or SE_LOGDIR.

While here,

• Avoid all hardcoded use of /var/db/softether, /var/log/softether Respect SE_DBDIR and SE_LOGDIR defined in Makefile
• Substitute these directories in pkg-message as well
• Regenerate some patches
• Bump PORTREVISION to force rebuild

Sponsored by: HAW International, Inc.