SEP20: Do not store default `abs_change` attr property
abs_change
attribute default configuration is redundantly set
by code and as an attribute property at the device creation
time. Setting it as an attribute property will interfere with the
SEP20 dump feature (export runtime configuration to the
persistent configuration) because we will consider it as the
user configuration, instead of the default value. Do not store
it as an attribute property to avoid this problem.
Fix #1774 (closed)
@sardana-org this is ready for review and eventual integration. Thanks a lot!