test/eventdev: pass timeout ticks unsupported

test/eventdev: pass timeout ticks unsupported

This commit reworks the return value handling of the
timeout ticks test. This feature is not mandatory for
a pmd, the eventdev layer returns -ENOTSUP if the PMD
doesn't implement the function.

The test is modified to check if the return value is
-ENOTSUP, and return -ENOTSUP to the test framework,
which can handle "unsupported" tests since patch[1].

As such, this test will function correctly if the
patchset linked below is applied, it fails if the
patch is not applied and the PMD doesn't the timeout
ticks function.

Note it does not depend (as a compile time dependency)
on the patchset linked below.

[1] http://dpdk.org/dev/patchwork/patch/21979/

Signed-off-by: Harry van Haaren <harry.van.haaren@intel.com>
Acked-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>