Updated openstack/openstack
Project: openstack/keystone  5d3157eb23c6146eadb22ebe1cca9c828ed07eea

Surround REMOTE_USER variable name with quotes.

REMOTE_USER should be surrounded with `` signs to follow RST rules.

Change-Id: I2c0ba8abff7950087a7828f30208292e66d8aaf8