Removing rewrite calls from default mgmt config

[jpl-btlunsfo]

Purpose

• Switching the management ui configuration to a solely proxypass-based configuration, removing possibly disruptive rewrite calls
• Adding some extra newline guards to the ssm-to-httpd-config process, so as to prevent httpd startup errors.

Proposed Changes

• CHANGE the managementproxy_config ssm-parameter contents to use upgrade=websocket (per docs) on its proxypass calls, rather than leaving an unguarded rewritecond/rewriterule section
• ADD force-inserted newlines after each fetched SSM parameter (as httpd config complains if two directives are on the same line)
• UPDATE the readme snippets

Issues

• no related open issues

Testing

• Currently live in unity-venue-dev: http://unity-dev-httpd-alb-285256043.us-west-2.elb.amazonaws.com:8080/management/ui/

[galenatjpl]

looks good!