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

  versions --ftp-ssl and --ftp-ssl-reqd as these options are now used to
  control SSL/TLS for IMAP, POP3 and SMTP as well in addition to FTP. The old
  option names are still working but the new ones are the prefered ones
  (listed and documented).

sent afterwards

  command is a special "hack" used by the drftpd server, but even though it is
  a custom extension I've deemed it fine to add to libcurl since this server
  seems to survive and people keep using it and want libcurl to support
  it. The new libcurl option is named CURLOPT_FTP_USE_PRET, and it is also
  usable from the curl tool with --ftp-pret. Using this option on a server
  that doesn't support this command will make libcurl fail.

receivers, and made the command line tool thus support the option specified
many times

user name

it in smtp.c

sequences in uploaded data. The test server doesn't "decode" escaped dot-lines
but instead test cases must be written to take them into account. Added test
case 803 to verify dot-escaping.