CP-12141: Removing unecessary ()'s from rrd API calls
CP-12141: Removing unecessary ()'s from rrd API calls

Signed-off-by: Ravi Pandey <af2601509f118043b35c32a9e090622ae3bf33cd@citrix.com>

euanh/xcp-idl,djs55/xcp-idl,johnelse/xcp-idl,xapi-project/message-switch,xapi-project/message-switch,Chunjie/xcp-idl,xapi-project/message-switch