Upgrade from 2.1.x/2.0.x - GcGem login crashes, may crash stone

During the startstone step of the upgrade process, the GcGems will attempt
to start up and login, which will crash with the message "unexpected error
4147". If STN_HALT_ON_FATAL_ERR is set to true, this will cause the stone
to exit also.

Although the GcGem startup fails, the gem processes themselves may remain,
even after the stone is later shut down, and require kill -9 to terminate.

Workaround:

There are two workarounds.

(1) Ensure STN_HALT_ON_FATAL_ERR is set to FALSE, and ignore the GcGem
startup failures. If necessary, kill -9 the gem processes later.

(2) for conversion, set STN_ADMIN_GC_SESSION_ENABLED = FALSE; STN_NUM_GC_RECLAIM_SESSIONS
= 0;

Be very careful to return these settings to the appropriate values for
the application after upgrade is complete.