inets: Rewrite of test case to avoid timing issues in test code
inets: Corrected appup
inets: Add tests using external proxy running on localhost
inets: Remove obsolete testcases that are now in the proxy suite
inets httpc: TLS via proxy

Introduces new option htts_proxy so that it is possible
to have different proxies for http and https. The new option
defaults to the old proxy option.

Implements HTTP-1.1 extension method CONNECT to establish SSL/TLS tunnel

We choose not to implement "TLS upgrade" as defined by RFC 2817 as
this method of upgrade is vulnerable to man in the middle attacks,
can be easily broken by proxies and does not seem to be widely adopted.
inets: Dialyzer fixes
inets httpc: Document that RFC 2817 is not supported
inets: Remove dbg tracing from testcases
inets - httpc_SUITE: add redirect tests for response 303

httpc contains code for redirecting http response
301, 302, 303, and 307, but no tests existed for
response '303 See Other'. Added tests (get, head, and post)
for 303 and renumbered tests for 307. The subtle thing is that
for 303 also post requests *should* be redirected.

Also added the necessary 303 page to the dummy_server.
inets: fix autoredirect for POST requests responding 303

Changed httpc_response, for redirect '303 See Other' also POST
requests should be redirected (using GET). See RFC2616 sect. 10.3.4
for clarification.
[inets] Appup test suite now handles version REs
inets httpc: Corrected separation of pipelining and persisten connections

OTP-10845
inets httpd: The option modules now defaults to its documented default value.

OTP-10844
inets: Improve ssl handling

httpc: CTfy test suite

httpd: Simplify ssl configuration OTP-10846
inets httpd: Handle ipfamily option correctly when listning to port 0

Conflicts:

	lib/inets/src/http_lib/http_transport.erl
Removed case clause for length = 0 for both HTTP1.0 and HTTP1.1
Handle correctly the "No files found or file unavailable" error code.
Added guard for invalid field and values in headers
inets httpc: Revert incorrect commit regarding cookie handling.
inets: stop block timer with the right arguments