phosphor-certificate-manager: Disable building tests

We don't yet use ptest so we are wasting cycles building tests

Change-Id: I4be55f6dd11bebf9f2556f35e8fa61d19bd953b2
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meta-phosphor/recipes-phosphor/certificate/phosphor-certificate-manager_git.bb b/meta-phosphor/recipes-phosphor/certificate/phosphor-certificate-manager_git.bb
index 9885240..5a5f1d4 100644
--- a/meta-phosphor/recipes-phosphor/certificate/phosphor-certificate-manager_git.bb
+++ b/meta-phosphor/recipes-phosphor/certificate/phosphor-certificate-manager_git.bb
@@ -26,6 +26,8 @@
 
 S = "${WORKDIR}/git"
 
+EXTRA_OECONF += "--disable-tests"
+
 CERT_TMPL = "phosphor-certificate-manager@.service"
 SYSTEMD_SERVICE_${PN} = "${CERT_TMPL}"