MOS-RN6.1 Keystone resolved issues
MOS-RN6.1 Keystone resolved issues

Adds Keystone resolved issue to the MOS 6.1
Release Notes page:

- keystone doesn't respond if cluster is actively used.

Change-Id: I4671d171932585c4adfad69ab3550128f1376c63

stackforge/fuel-docs,ogelbukh/fuel-docs,ogelbukh/fuel-docs,ogelbukh/fuel-docs,ogelbukh/fuel-docs,stackforge/fuel-docs