Modifying packaging to make the DHCP GUI work from WAR bundle-style packaging.

Change-Id: I1b9685fa1eebcac63ad41bc60db1f98b30aba656
diff --git a/apps/dhcp/src/main/resources/gui/css.html b/apps/dhcp/src/main/resources/gui/css.html
new file mode 100644
index 0000000..d02ad44
--- /dev/null
+++ b/apps/dhcp/src/main/resources/gui/css.html
@@ -0,0 +1 @@
+<link rel="stylesheet" href="app/view/dhcp/dhcp.css">
\ No newline at end of file