Don't log every readonly API call.
Don't log every readonly API call.

This causes the periodic SR.scans to produce a lot less log spam - these
lines make up about 20% of xensource.log at the moment if there is an SR
being autoscanned.

Signed-off-by: John Else <37b74501daa612e48fea94f9846ed4ddeb6a8f07@citrix.com>

koushikcgit/xcp-networkd,koushikcgit/xcp-networkd,sharady/xcp-networkd,djs55/xcp-networkd,djs55/xcp-networkd,sharady/xcp-networkd