get_sysfs_attr_as_boolean_uncached

Look up the sysfs attribute with name on this and convert it to an boolean.

This is done by doing a case-insensitive string comparison on the string value against "1", "true", "Y" and "y". This function does blocking I/O, and updates the sysfs attributes cache.

Before version 238 the uncached getters would not strip trailing newlines.

Parameters:

this	A Device.
name	Name of the sysfs attribute.

Returns:

The value of the sysfs attribute or false if there is no such attribute.