Recipe update: User management, systemd patch, IPMI net functions

Create virtual class to include user management in the image
Add the systemd patch for network support to the systemd recipe
Update the IPMI recipe to pickup the support for network configuration
diff --git a/meta-phosphor/conf/distro/openbmc-phosphor.conf b/meta-phosphor/conf/distro/openbmc-phosphor.conf
index 418a98e..4af4a4b 100644
--- a/meta-phosphor/conf/distro/openbmc-phosphor.conf
+++ b/meta-phosphor/conf/distro/openbmc-phosphor.conf
@@ -26,6 +26,7 @@
         obmc-phosphor-flash-mgmt \
         obmc-phosphor-event-mgmt \
         obmc-phosphor-policy-mgmt \
+        obmc-phosphor-user-mgmt \
         obmc-phosphor-system-mgmt \
         ${DISTRO_FEATURES_LIBC} \
         "