[Predicate] Override __bool__ to allow py3 evaluation

The check in `Plugin.test_predicate()` relies on a 'is not None' test,
which on py2 invokes a call to `SoSPredicate.__nonzero__()` which in
turns runs our evaluation of the predicate. On py3 however, this test is
an explicit check to see if the object is `NoneType`. As such,
`__nonzero__()` never runs and the predicate defaults to always
evaluating ad `True`. This effectively removed any gating for command
execution on py3.

By overriding `SoSPredicate.__bool__()` to wrap `__nonzero__()` we can
ensure that predicate evaluation is performed properly on both py2 and
py3 runtimes.

Closes: #1839
Resolves: #1840

Signed-off-by: Jake Hunsaker <jhunsake@redhat.com>

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