Finish updating to newer shorewall6 syntax.

From http://shorewall.net/manpages6/shorewall6-rules.html:
	Example: FTP(ACCEPT).

	The older syntax where the macro name and the target are
	separated by a slash (e.g. FTP/ACCEPT) is still allowed but is
	deprecated.
Include Makefile for CLIENT_DIST_FILES.

Ximin in #6810 made me realize that the client packages should include
Makefile, so "make install" works.

I may not keep making client packages because I suspect they are hardly
used and they are subsumed by the pluggable transports bundle and
upcoming Debian packages. But here this is for posterity.
Move websocket-transport to /pluggable-transports/websocket.git.

Per #9863.