Dont produce pumors when myself is dead (#45)

This is a follow-up for #42 (issue #35). In addition to the explicit
flag, this patch implicitly disables suspiciousness in case the current
instance is dead.

Author: rosik

CHANGELOG.md

@@ -9,7 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 
 - New option `SUSPICIOUSNESS` (default: `true`) allows to
-  disable generation of rumors about suspected members.
+  disable generation of rumors about suspected members. Also,
+  membership won't produce any rumors unless myself is alive.
 
 - New option `log_debug` which can be easily overridden to
   control the verbosity level.

membership.lua

@@ -508,7 +508,10 @@ local function _protocol_step()
         members.set(uri, member.status, member.incarnation, { clock_delta = delta })
         return
     elseif members.get(uri).status == opts.ALIVE then
-        if opts.SUSPICIOUSNESS == false then
+        local myself = members.get(advertise_uri)
+        if myself.status ~= opts.ALIVE then
+            opts.log_debug('Could not reach node: %s (%s myself)', uri, myself.status)
+        elseif opts.SUSPICIOUSNESS == false then
             opts.log_debug('Could not reach node: %s (ignored)', uri)
         else
             log.info('Could not reach node: %s - %s', uri,