[title]
Ensure the system is running with optimal load

[description]
This check examines the CPU and IO load of the system. If a system is running
with very high loads, then system could turn unresponsive and applications can
take more time to react/complete.

[param avgload]
System usage (in percent) at which to raise a exception.
Valid values are integers in the range 1 to 100.

[param time]
Time for which load average needs to be checked.
Valid values are 1, 5, 15. You can specify more than one timestamp separated by
comma (,).

Example:
#1,15
