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
Update release notes

Conflicts:

	lib/inets/doc/src/notes.xml
Fix some errors in the inets documentation
fix: typo, inets/doc/src/httpd
[inets, ssl]: make log_alert configurable as option in ssl, SSLLogLevel added as option to inets conf file

Conflicts:

	lib/inets/src/http_lib/http_transport.erl
	lib/inets/src/inets_app/inets.appup.src
	lib/ssl/src/ssl.appup.src
Fix httpd config option 'erl_script_nocache'

This fixes the usage of the httpd configuration option
'erl_script_nocache', which got ignored before.

Attention: Before, the option 'script_nocache' also changed the
behavior for mod_esi, now it only affects mod_cgi.
inets: added simple testcase for option erl_script_nocache
Test nocache option of mod_cgi and mod_esi

Tests that the nocache options work and can be used independently from
each other. This was broken before c8ef69c.

Conflicts:

	lib/inets/test/httpd_basic_SUITE.erl
inets: Add stronger RSA test-keys

The ones provided will fail inets test cases as default ssl will
negotiate stronger cipher suites now that will fail the with the weak keys.
inets: httpc improve pipelining
Add test for httpd config option 'script_timeout'

The option got ignored before 720721e.
inets: added testcase for keep_alive_timeout
httpc: Enhanched error handling
httpc: Allow content body in DELETE requests