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/common/recipes-phosphor/obmc-phosphor-user/files/obmc-phosphor-user.service b/common/recipes-phosphor/obmc-phosphor-user/files/obmc-phosphor-user.service
new file mode 100644
index 0000000..fecf835
--- /dev/null
+++ b/common/recipes-phosphor/obmc-phosphor-user/files/obmc-phosphor-user.service
@@ -0,0 +1,8 @@
+[Unit]
+Description=Phosphor OpenBMC user management daemon
+
+[Service]
+ExecStart=/usr/sbin/obmc-phosphor-userd
+
+[Install]
+WantedBy=multi-user.target