Add python-dateutil for nova api

Change-Id: I6926fec02e432cbbe49312aa51b0a931d8a091f3
diff --git a/files/apts/n-api b/files/apts/n-api
new file mode 100644
index 0000000..0f08daa
--- /dev/null
+++ b/files/apts/n-api
@@ -0,0 +1 @@
+python-dateutil