Reduce MQ channel error reporting for connection list

The MQ client on Windows logs everything by default. It all goes to Windows
Eventlog. Every MQ Client connection attempt that has a failure is logged as
error.

Here is our issue:
- client application connects with a channel table.
- channel table has 4 entries, for the 4 hosts on which the queue may be active
at any given time (active/passive).
- the first three connection attempts are unsuccessful, since the queue manager
is not active on those 3 hosts.
- the fourth connection attempt is successful.

We are seeing in AMQERR01.LOG that the first three failures are logged. While
these individual attempts are indeed unsuccessful, in the bigger picture the
MQCONN call by the application is successful.

The monitoring agent (HPOV) reads the 3 errors and reports them as failed
connections. This is misleading since the application connected successfully,
and is generating superfluous and misleading alarms.

We are looking for a modification to the MQ Client API behavior such that we
can reduce or eliminate these unnecessary connection errors being reported in
the log, and only report an unsuccessful connection when all appropriate
connection entries in the CCDT are not able to satisfy the initial MQCONN
request.

We do not wish to suppress these error messages using the "ExcludeMessage"
or "SuppressMessage" attributes under the "QMErrorLog" stanza in qm.ini, since
that will eliminate all such messages, including otherwise valid ones.