If the last receive time for a remote MP was before the last fault
check, the CFM code would not declare a fault. This is, of course,
exactly the wrong response.
Bug #5303.
Scattered throughout the code base we use long integers to
implement timers. When the result of timer_msec() is greater than
the time stored, we preform some action.
This commit creates a new timer library intended to replace these
manually managed timers. Code using the timer library will be more
obviously correct, and more consistent with other code using the
library.
