id_jiff_foo: test scripts to common directory

Generalized tests scripts for id and jiff and move them to parent
directory.
id_jiff_foo: include foo_debufs

Place foo_debugfs under id_jiff_foo/ which was missed during previous
re-organization.  Generalize its test script and move to the parent
directory.
id_debugfs: remove out of date README
id_misc: shorten by joining a line
first id_sysfs driver working

The first "id_" driver using sysfs is working and passes the test-id.sh script.
id_sysfs: show/store length check, human readable

Perform proper length checks in show/store operations.

Produce human readable output with newlines.  And accept input that
might have a newline.
id_sysfs: add release function

Add release function as per Documentation/kobject.txt.