Improve ulog memory hygiene

Improve ulog memory hygiene

Add a helper create_log_context() to initialize a krb5_context's
kdblog_context field, setting ulogfd to -1.  Use it in ulog_set_role()
and ulog_map().  In ulog_fini(), release ulogfd if it is not -1.

In ulog_map(), add a cleanup label and use it to finalize the log
context on failure, so that we don't (trivially) leak the mapped ulog.
To reduce the number of "retval = errno;" statements required for this
change, make extend_file_to() return a krb5_error_code.

The ulog leak on error was reported by Bean Zhang.

ticket: 8707