inets: Remove use of default gen_server timeout

If you need a timeout between client and server use a server side
timeout instead of the default gen_server:call/2 timeout that is quite
useless. Also remove legacy code that has no further use.
inets: Start CT'ify httpd_SUITE
inets: Mend broken max_clients check

Conflicts:

	lib/inets/src/http_server/httpd_manager.erl
inets: Remove log message as it causes more harm than use at the moment
inets: Prepare for release
Prepare release