CP-2190 for PR-1221: performance alert for host sr throughput
CP-2190 for PR-1221: performance alert for host sr throughput

Added perfmon defaults for "sr_io_throughput_total_xxxxxxxx" alert
for throughput on the SR whose uuid starts with xxxxxxxx.
(Second of two parts of CP-2190)

Signed-off-by: Thomas Sanders <c547603d2dd860735c4f0c043b1348f5c48c02f8@citrix.com>

djs55/xcp-rrdd,djs55/xcp-networkd,simonjbeaumont/xcp-rrdd,djs55/xcp-rrdd,simonjbeaumont/xcp-rrdd,koushikcgit/xcp-networkd,johnelse/xcp-rrdd,johnelse/xcp-rrdd,djs55/squeezed,sharady/xcp-networkd,djs55/xcp-networkd,koushikcgit/xcp-rrdd,robhoes/squeezed,koushikcgit/xcp-networkd,koushikcgit/xcp-rrdd,koushikcgit/xcp-rrdd,sharady/xcp-networkd