Add ssl support to gearman / gearman_server

Enable SSL support for gearman. We also created an new SSLZuulBaseTest
class to provide a simple way to use SSL end to end where possible. A
future patch will enable support in zookeeper.

Change-Id: Ia8b89bab475d758cc6a021988f8d79ead8836a9d
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
diff --git a/tests/fixtures/gearman/root-ca.pem b/tests/fixtures/gearman/root-ca.pem
new file mode 100644
index 0000000..defedd6
--- /dev/null
+++ b/tests/fixtures/gearman/root-ca.pem
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