Secure cinder with http security headers

Add http security headers to cinder/api/openstack/wsgi.py while rendering response. The http response can be updated with additional security headers if the response has the attribute "headers". This will help in strengthening the security for cinder and provide protection against various security breaches.
HTTP Security headers that can be added :
    { 'X-Content-Type-Options': 'nosniff',
    'Strict-Transport-Security': 'max-age=63072000; includeSubDomains',
    'Content-Security-Policy': "script-src 'self'; object-src 'self'",
    'X-Frame-Options': 'DENY',
    'X-Permitted-Cross-Domain-Policies': 'none',
    'X-XSS-Protection': '1; mode=block',
}