Fix httpd config option 'keep_alive_timeout'

The documentation states that the value is in seconds, which was true
when using the Apache like configuration file, but not true when using
the proplist style configuration.
Fix httpd config option 'script_timeout'

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

The documentation states that the value is in seconds, which was true
when using the Apache like configuration file, but not true when using
the proplist style configuration.
inets: httpc improve pipelining
httpc: Enhanched error handling
inets: httpc make httpc_cancel_request/[1,2] asynchronous
Add test for httpd config option 'script_timeout'

The option got ignored before 720721e.
inets: httpc - Remove dead error handling code

Some error handling is only relevant for functions that
end up in gen_server:call and not in gen_server:cast.
inets: added testcase for keep_alive_timeout
Merge branch 'weisslj/fix-httpd-timeout-options/OTP-11276' into maint

* weisslj/fix-httpd-timeout-options/OTP-11276:
  inets: added testcase for keep_alive_timeout
  Add test for httpd config option 'script_timeout'
  Fix httpd config option 'script_timeout'
  Fix httpd config option 'keep_alive_timeout'
Merge branch 'ia/inets/http-client-cancel-request/OTP-11312' into maint

* ia/inets/http-client-cancel-request/OTP-11312:
  inets: httpc - Remove dead error handling code
  inets: httpc make httpc_cancel_request/[1,2] asynchronous
  httpc: Enhanched error handling
  inets: httpc improve pipelining
[inets/httpd] Fixed mod_head handling of "new" response
[inets/httpd] Logging cleanup

Remove logging when fo keep-alive connection timeout. This is
a normal event (feature) not an error.
[inets/httpd] Improved access log entry

Sometimes the size of a response could be as a string.
[inets/httpd] Improved request handler terminate error-log entry

If a request handler terminates abnormally (terminate reason not
normal), the error-log entry was a bit obtuse ("Internal Server Error").
This has been improved so that the log entry now also include the
actual terminate reason.
[eldap, inets]: fix testcases when ssl not is present
ftp: Implement ftps (upgrade to TLS)
ftp: Implement ftps (upgrade to TLS)
ftp: old ftp_SUITE re-written and works
ftp: towards a working ftps, chapter 1
added some printouts