LP#1705728 Batch fine gen. caching/parallel optimize

LP#1705728 Batch fine gen. caching/parallel optimize

* Fine generator caches org unit setting values per instance.  Once
  cached, the number of cstore calls per transaction is reduced by
  3 to 5 calls, depending on context / settings.

* Fine generator disconnects from cstore after processing each
  transaction giving cstores a chance to recycle and avoid memory
  gobbling on huge batches.

* Fine generator now collects parallel batches of transactions directly
  within the server-side generator API instead of requiring the caller
  to collect transactions up front for individual processing.  This lets
  us take advantage of the new org setting caching.

* Fine generator script improvements:
** Arguments are passed via GetOpt, with support for legacy-style
   opensrf config and lockfile name passing (with warning).
** supports a --parallel option to override the value from opensrf.xml.
** Sets OSRF_LOG_CLIENT for log tracing.

Signed-off-by: Bill Erickson <berickxx@gmail.com>