Collecting OTMA checkpoint statistics

The two X'45' statistic record types are written with the X’45’ records during checkpoint processing. The X'451A' record is written for OTMA global information and the X'451B' record is written for member information for each OTMA member. These records are mapped by DSECTs in macros DFSL451A and DFSL451B. These statistics include TPIPE and YTIB information such as current number in use, high use number since last checkpoint, and upper limits. The current number of YQABs in use is included in the X'451A' record. This YQAB value is the total YQAB count for the primary YQAB of TPIPEs, hold queue YQAB of TPIPEs, and MQAB for MULTIRTP function.