doc for enabling CSP support on xenserver 6.1
doc for enabling CSP support on xenserver 6.1

https://issues.apache.org/jira/browse/CLOUDSTACK-6574

Signed-off-by: Sebastien Goasguen <250735a416ca4fba2eb297c8d62b7a634570c133@gmail.com>

unodba/cloudstack-docs-install,pdion891/cloudstack-docs-install,pdion891/cloudstack-docs-install,apache/cloudstack-docs-install,pdion891/cloudstack-docs-install,unodba/cloudstack-docs-install,unodba/cloudstack-docs-install,apache/cloudstack-docs-install,apache/cloudstack-docs-install