tests/Genlog: Return 1 if any tests fail, otherwise 0

d6e1fc22-3d46-11e4-8d4e-c80aa9e67bbd
Makefiles in "tests/" directories should return error if any tests fail

Remove grep command from two Makefiles to avoid messing up the return
value.

44d42796-3d47-11e4-a0a3-c80aa9e67bbd