fix on_join signature in mesos client
fix on_join signature in mesos client





thinker0/aurora,apache/aurora,kidaa/aurora,medallia/aurora,thinker0/aurora,rosmo/aurora,apache/aurora,mkhutornenko/incubator-aurora,mkhutornenko/incubator-aurora,mschenck/aurora,protochron/aurora,apache/aurora,wfarner/aurora,rdelval/aurora,wfarner/aurora,rdelval/aurora,mschenck/aurora,thinker0/aurora,kidaa/aurora,shahankhatch/aurora,apache/aurora,rdelval/aurora,mschenck/aurora,medallia/aurora,protochron/aurora,shahankhatch/aurora,mschenck/aurora,shahankhatch/aurora,shahankhatch/aurora,mschenck/aurora,crashlytics/aurora,mkhutornenko/incubator-aurora,wfarner/aurora,rosmo/aurora,apache/aurora,rosmo/aurora,thinker0/aurora,medallia/aurora,mkhutornenko/incubator-aurora,kidaa/aurora,mschenck/aurora,crashlytics/aurora,kidaa/aurora,kidaa/aurora,wfarner/aurora,medallia/aurora,medallia/aurora,apache/aurora,protochron/aurora,crashlytics/aurora,crashlytics/aurora,shahankhatch/aurora,medallia/aurora,rosmo/aurora,kidaa/aurora,wfarner/aurora,shahankhatch/aurora,crashlytics/aurora,mkhutornenko/incubator-aurora,crashlytics/aurora,rdelval/aurora,rosmo/aurora,thinker0/aurora,rdelval/aurora,rdelval/aurora,protochron/aurora,protochron/aurora,thinker0/aurora,protochron/aurora,wfarner/aurora,rosmo/aurora