[Disk] Added parametrization of disk_allocation_ratio.

Change-Id: Icc734e213bf4f3f94defc7b10f68914cfa86a3b6
diff --git a/other-requirements.txt b/other-requirements.txt
new file mode 100644
index 0000000..ba84cc5
--- /dev/null
+++ b/other-requirements.txt
@@ -0,0 +1 @@
+python-yaml