Add driver-requirements.txt

This aims to track dependencies that are only needed
when using certain drivers.

This is initially aiming to be documentation, but it
may be useful for tools managing requirements as well.

Change-Id: Ida342fb5bf15e9fcc1321813f8e3b0ec90121a40

driver-requirements.txt

@@ -0,0 +1,38 @@
+# Document dependencies that are only used if using
+# certain drivers.  This file is not managed by
+# requirements tools.
+
+# DRBD
+dbus # MIT
+drbdmanage # GPLv3
+
+# HPE 3PAR
+hpe3parclient>=4.1.0 # Apache-2.0
+
+# Kaminario
+krest>=1.3.0 # Apache-2.0
+
+# Pure Storage
+purestorage>=1.6.0 # BSD
+
+# Dell EMC VMAX, IBM DS8K
+pyOpenSSL>=1.0.0 # Apache-2.0
+
+# HPE Lefthand
+python-lefthandclient>=2.0.0 # Apache-2.0
+
+# Fujitsu Eternus DX
+pywbem>=0.7.0 # LGPLv2.1+
+
+# IBM XIV
+pyxcli>=1.1.0 # Apache-2.0
+
+# RBD
+rados # LGPLv2.1
+rbd # LGPLv2.1
+
+# Dell EMC VNX
+storops>=0.4.8 # Apache-2.0
+
+# Violin
+vmemclient>=1.1.8 # Apache-2.0