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Add support for DB2 HADR standby monitoring

Add support for DB2 HADR standby monitoring

DPA cannot currently monitor all aspects of a DB2 HADR standby instance with ROS (reads on standby) enabled.

DPA can currently monitor the basics of a DB2 instance database but not with any of the following DB2 DBM configuration monitor switches enabled:

Unit of work                        (DFT_MON_UOW) = OFF
Table                             (DFT_MON_TABLE) = OFF
Statement                          (DFT_MON_STMT) = OFF
Sort                               (DFT_MON_SORT) = OFF
Lock                               (DFT_MON_LOCK) = OFF
Buffer pool                     (DFT_MON_BUFPOOL) = OFF

The problem is DPA's polling issues calls to the DB2 instance that _possibly_ require a "writeable" database.

DB2 diagnostic log entry:

FUNCTION: DB2 UDB, buffer pool services, sqlbDirectWrite, probe:123

MESSAGE : ZRC=0x80100469=-2146433943=SQLP_HDRS_READ_ONLY

"The operation that attempted to modify the contents of the database failed"

DATA #1 : <preformatted>

Direct writes are not supported on HADR Standby database.

We have a need to monitor statement level performance on our standby server as we've shifted a bulk of our read-only workloads to the standby server.  I understand if this is a no-go since the defect might well lie with IBM DB2 LUW HADR architecture.

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