MDEV-7914: spider/bg.ha, spider/bg.ha_part crash server sporadically in buildbot
The crash occurs when a thread that is closing its connection attempts to access Spider transaction information when another thread has freed that memory while processing Spider plugin deinit. This occurs because Spider does not adjust the plugin's reference count when it sets a transaction information pointer for the plugin. The fix I implemented changes the way Spider sets the transaction information pointer to use thd_set_ha_data() so that Spider's plugin reference counter is adjusted as well. Author: Jacob Mathew. Reviewer: Kentoku Shiba. Merged From: Commit eabfadce on branch bb-10.3-MDEV-7914
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