fix read/write tests to pass as root

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
improve read write tests to run under root

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
add more read tests

Signed-off-by: Caleb Cushing <xenoterracide@gmail.com>
v0.39

	- fix tests failing to run as user with override privileges
	  RT #88543 ( zefram )
	- add more tests