CP-2190 for PR-1221: performance alert for host memory use

Added perfmon defaults for "memory_total_kib" alert
(first part of CP-2190)

Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>
Slight correction and comment-update in perfmon

rrd_regex must match the whole data-source name, not just a substring

Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>
Changed dummy regex (in perfmon) to one that cannot match anything.

Signed-off-by: Thomas Sanders <thomas.sanders@citrix.com>
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 <thomas.sanders@citrix.com>
Fix a comment
Merge pull request #979 from thomassa/pr1221

CP-2190 for PR-1221: host alerts for memory-use and sr-throughput