travis: parallel builds and tests

Some recent travis builds have failed due to having exceeded the
per-job time limit of 50 minutes. This change enables parallel
builds and parallel test execution in order to reduce overall
execution time, and will hopefully allow this class of build
failures to be avoided.

Since the travis build environment is provisioned with two CPUs,
use -j2 for builds and -j4 for tests. Testing in a cloned repository
shows slightly more than a 50% reduction in overall test time.

Signed-off-by: Lance Richardson <lrichard@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

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