try_read1msg. Blind fix, problem was not duplicated/tested.

- use bervals for url and sockname
- pass connection_init() the listener struct pointer instead of each value
- don't copy them in the Connection struct 'cause they're not going to change
- define macros for legacy usage of c_listener_url and c_sockname

to 2.0.1 as to the location to the copy.

Written by Hallvard B. Furuseth and placed into the public domain.
This software is not subject to any license of the University of Oslo.

'ldapmodify -c' returned the error status from the _last_ LDIF entry,
so a bad entry followed by a good entry returns success.
This patch makes it return the status of the last _failed_ entry,
or 0 if all entries succeeded.

According to read(2)/write(2) EAGAIN is the only one we're interested in.
Fixes HP-UX 11.
http://www.openldap.org/lists/openldap-software/200105/msg00564.html

Written by Hallvard B. Furuseth and placed into the public domain.
This software is not subject to any license of the University of Oslo.