misc oprofile-tests updates

Hi Oprofile devs,

A handful of changes to the oprofile-tests suite, for consideration.

I stumbled across an issue while running the tests, dug in a bit, and came
out with this short series of patches to improve things.  Most of the
changes are cosmetic, but a couple will affect the suite behavior, most
notably that more of the tests will be runnable as a normal user, and we
will successfully run more tests as root when the kptr_restrict mode is
in restricted mode, where we previously would have punted.  (Additional
detail in the patch descriptions.)

I've tested these changes against an older (0.9.8) install, as well as
against latest (1.2.0git), no new issues in my testing.

As a user:
before:  49/49 tests passed.
after:   74/78 to 78/78 tests passed.  (depending on the value of kptr_restrict)

As root:
No notable changes.  My latest run showed
after:  113/117 to 117/117 tests passed.  (depending on kptr_restrict)

Thanks,
-Will


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