Add fix for Missing "OU" OrganizationalUnit CSR

generateCSR function missed to include the "OU" field
information during CSR generation. Fix is to add this
missing field in the CSR.

Details available in issue #phosphor-certificate-manager/18

Tested:
 Created CSR string and verified "OU" field is present.

Signed-off-by: Jayanth Othayoth <ojayanth@in.ibm.com>
Change-Id: I70a7d53f85b01241b91e40e666539c194e217973
diff --git a/certs_manager.cpp b/certs_manager.cpp
index f833a95..9eb3c9f 100644
--- a/certs_manager.cpp
+++ b/certs_manager.cpp
@@ -387,6 +387,7 @@
         }
     }
     addEntry(x509Name, "O", organization);
+    addEntry(x509Name, "OU", organizationalUnit);
     addEntry(x509Name, "ST", state);
     addEntry(x509Name, "SN", surname);
     addEntry(x509Name, "unstructuredName", unstructuredName);