refactored stopping of test harness servers

maketgz already converts this file to DOS style with an awk filter.

subroutines for ssh and socks test suite servers.

the <killserver> section of test harness definition files.

  being properly detected under certain circumstances. It had been caused by
  strange behavior of pkg-config when handling PKG_CONFIG_LIBDIR. pkg-config
  distinguishes among empty and non-existent environment variable in that case.

and slow data transfer in a similar way as test case #1086 does for FTP.

This also exercises <killserver> section for the FTPS server.

for the <killserver> section of test harness definition files.

  transfers: curl_multi_fdset() would return -1 and not set and file
  descriptors several times during a transfer of a single file. It turned out
  to be due to two different flaws now fixed. Gil's excellent recipe helped me
  nail this.

much as possible in one go, as long as it doesn't block and hasn't reached the
end of the state machine.
This avoids spurious -1 returns from curl_multi_fdset() simply because
previously it would return from this function without anything in EWOUDLBLOCK
and thus basically it wasn't actually waiting for anything!!

state, we return CURLM_CALL_MULTI_PERFORM unconditionally then so that we
can act faster like in the case the protocol-specific connect doesn't block
on anything and we can just persue on the next action immediately. It also
then avoids a case where curl_multi_fdset() would return -1.

  interval even during very slow connects.

  present in the tests/data/Makefile.am and outputs a notice message on the
  screen if not. Each test file has to be included in that Makefile.am to get
  included in release archives and forgetting to add files there is a common
  mistake. This is an attempt to make it harder to forget.

Start using the centralized pidfile and logfile name generation
subroutines for https and ftps test suite servers.

Update error message to include port number

Previous commit adjustments

Start using the centralized pidfile and logfile name generation
subroutines for ftp, pop3, imap and smtp test suite servers.

  ossl_connect_step3() increments an SSL session handle reference counter on
  each call. When sessions are re-used this reference counter may be
  incremented many times, but it will be decremented only once when done (by
  Curl_ossl_session_free()); and the internal OpenSSL data will not be freed
  if this reference count remains positive. When a session is re-used the
  reference counter should be corrected by explicitly calling
  SSL_SESSION_free() after each consecutive SSL_get1_session() to avoid
  introducing a memory leak.

  (http://curl.haxx.se/bug/view.cgi?id=2926284)

subroutines for http and tftp test suite servers.

the need for the struct forward declaration from http.h which caused problems
with gcc 2.96 and quite frankly the parameter wasn't necessary anyway

function was moved to http.c and was made static and renamed

  name resolves when c-ares is used for resolving.

IRIX MIPSpro 7.4 C++ compiler does not tolerate inclusion of stdint.h