Adding GUI for displaying the DHCP Mappings. DHCP REST API disabled.

Change-Id: I59f4600e3efd3e53f3ebcb5d4ced7381625529c4
diff --git a/onos-app-dhcpserver/src/main/resources/css.html b/onos-app-dhcpserver/src/main/resources/css.html
new file mode 100644
index 0000000..d02ad44
--- /dev/null
+++ b/onos-app-dhcpserver/src/main/resources/css.html
@@ -0,0 +1 @@
+<link rel="stylesheet" href="app/view/dhcp/dhcp.css">
\ No newline at end of file