mrouted v4.6

This release is a major refactor of the internal timer and socket handling, it also contains a major speedup of the peering of DVMRP routers at startup.

Fixes

• Issue #56: ensure group timers are stopped when stopping interfaces
• Issue #56: replace homegrown timer and socket handling with pev v2.0. The existing timer implementation was too imprecise and jittered several seconds between query intervals
• Issue #64: fix compiler warnings when building with 64-bit time_t targeting 32-bit platforms (only affects logging and status output)
• Fix mroutectl show routes, locally connected routes never expire
• Skip timeout of subordinates at startup
• Minor compiler warnings on non-Linux systems

Changes

• Check interface status and update internal state on more error codes instead of logging sendto() or sendmsg() failure
• Revert change in TIMER_INTERVAL from v4.0, 4159022, update interval is now 5 seconds instead of 2
• Removed internal log rate limiter, demystifies behavior and greatly simplifies the code
• Log interface names with their assigned VIF number to ease debugging
• Speed up peering by sending route reports as soon as one-way peering has been established
• Updates to logging, clarifying source 0.0.0.0 of routes as "us", and add logging when adding and discarding groups to/from interfaces
• Use (S, G) format for all logging
• Silence bogus Failed MRT_DEL_MFC warnings for routes never added to the MRIB due to missing reverse path