refactored tls code

[mbhangui]

ucspi-tcp

1. moved tls functions to libqmail. tls.c, tls.h removed
2. dotls.c: added -D, -t option for timeoutdata, timeoutconn.
3. dotls.c, tcpclient.c, tcpserver.c: added -z option to turn on setting of TLS_PROVIDER env variable
4. dotls.c: log ssl cipher bits
5. dotls.c, tcpserver.c, tcpclient.c: replace internal TLS function with TLS functions from libqmail
6. removed iopause.c, iopause.h. Use iopause functions from libqmail
7. tcpserver.c: added -S option for connection timeout

indimail-mta

1. 822date.c, 822print.c, 822received.c, maildirserial.c, new-inject.c, nowutc.c, ofmipd.c, parsedate.c, set_environment.c: removed auto_sysconfdir.h dependency
2. dnstlsarr.c, qmail-daned.c: use tls.h from libqmail
3. Makefile: removed ssl functions and auto_sysconfdir dependency for programs not using auto_sysconfdir
4. qmail-greyd.c, qmail-daned.c, tablematch.c: Set hints.ai_socktype to SOCK_STREAM
5. qmail-remote.c: set default certificate dir to /etc/indimail/certs
6. qmail-remote.c: use set_tls_method() from libqmail
7. starttls.h: define variables used in qmail-daned, dnstlsarr as extern
8. smtpd.c: redefine saferead, safewrite to use tlsread, tlswrite from libqmail
9. smtpd.c, sslerator.c: replace internal TLS function with TLS functions from libqmail
10. smtpd.c: made global variables static
11. smtpd.c: fixed erroneous "out of memory" instead of "command too long" error
12. sslerator.c: changed default cert location to /etc/indimail/certs
13. sslerator.c: replace internal TLS function with TLS functions from libqmail
14. sslerator.c: added timeouts for connection accept
15. starttls.c: replace set_tls_method() from libqmail
16. starttls.c: made global variables static