RDKB-12267: webgui.sh Headers CSP and X-frame-options
RDKB-12267: webgui.sh Headers CSP and X-frame-options

Reason for change: webgui.sh implement content-security-policy and X-frame-options for broadcom
Test Procedure:  Test in WebUI,
Check Response Headers for content-security-policy and X-frame-options as shown in https://ccp.sys.comcast.net/secure/attachment/1258929/Content-Security-Policy_X-frame-options%20.png
Risks: None

Change-Id: I74a6dea36826cacc96214dd2201655429b50f6b8
Signed-off-by: a8f9a3d7657f430d7bbf243a23806b75d466f78c@infosys.com

rdkcmf/rdkb-webui,rdkcmf/rdkb-webui,rdkcmf/rdkb-webui,rdkcmf/rdkb-webui,rdkcmf/rdkb-webui