David Moreau Simard 4fe18c6492
callback: disable threading by default
Threading is prone to database lock exceptions when using the default
database backend (sqlite) and so disable it by default.

Users can enable threading when using mysql or postgresql by specifying
the ARA_CALLBACK_THREADS environment variable or callback_threads in
ansible.cfg.

Fixes: https://github.com/ansible-community/ara/issues/195
Change-Id: I80edfd6268684722c2783e01323355d791c19b9d
2020-12-18 10:25:01 -05:00
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