configuration: add details about sudoers configuration when adding non-root user

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
(cherry picked from commit 1bf8b0b261f4e80b64450b1b002804e45b61a24b)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
diff --git a/source/configuration.rst b/source/configuration.rst
index c1771dc..1dcb9a9 100644
--- a/source/configuration.rst
+++ b/source/configuration.rst
@@ -1061,6 +1061,11 @@
    on the KVM host and set the parameter network.bridge.type to
    openvswitch before adding the host to CloudStack
 
+-  If you're using a non-root user to add a KVM host, please add the user to
+   sudoers file:
+   .. sourcecode:: bash
+      cloudstack ALL=NOPASSWD: /usr/bin/cloudstack-setup-agent
+      defaults:cloudstack !requiretty
 
 Adding a XenServer or KVM Host
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^