Prerequisite should include curl install for OpenSDS Integration with Kubernetes CSI

[sushanthakumar]

Issue/Feature Description:
Prerequisite to be updated for OpenSDS Integration with Kubernetes CSI to add the installation of curl
currently Prerequisite looks like below

On a fresh system installation fails due to curl

Why this issue to fixed / feature is needed(give scenarios or use cases):
curl need to be added to installation list

How to reproduce, in case of a bug:

Other Notes / Environment Information: (Please give the env information, log link or any useful information for this issue)