log_service: Fix regression
log_service: Fix regression

a644d058c69 introduced a regression where if messenger
wasn't up before the log service or didn't come up
IMMEDIATELY after the log service first tried to come
up, the log service would never be started.

Eventually, a component superclass/metaclass or some
startup helper function should take the place of
this code anyway.

xAKLx/pox,kpengboy/pox-exercise,pthien92/sdn,adusia/pox,PrincetonUniversity/pox,kpengboy/pox-exercise,pthien92/sdn,xAKLx/pox,andiwundsam/_of_normalize,andiwundsam/_of_normalize,kulawczukmarcin/mypox,denovogroup/pox,diogommartins/pox,kulawczukmarcin/mypox,denovogroup/pox,andiwundsam/_of_normalize,noxrepo/pox,noxrepo/pox,andiwundsam/_of_normalize,pthien92/sdn,diogommartins/pox,jacobq/csci5221-viro-project,adusia/pox,chenyuntc/pox,kavitshah8/SDNDeveloper,denovogroup/pox,pthien92/sdn,diogommartins/pox,waltznetworks/pox,carlye566/IoT-POX,kulawczukmarcin/mypox,jacobq/csci5221-viro-project,adusia/pox,chenyuntc/pox,noxrepo/pox,VamsikrishnaNallabothu/pox,chenyuntc/pox,MurphyMc/pox,adusia/pox,carlye566/IoT-POX,adusia/pox,jacobq/csci5221-viro-project,PrincetonUniversity/pox,kavitshah8/SDNDeveloper,MurphyMc/pox,PrincetonUniversity/pox,xAKLx/pox,kavitshah8/SDNDeveloper,kavitshah8/SDNDeveloper,pthien92/sdn,carlye566/IoT-POX,xAKLx/pox,kpengboy/pox-exercise,PrincetonUniversity/pox,waltznetworks/pox,jacobq/csci5221-viro-project,kpengboy/pox-exercise,diogommartins/pox,jacobq/csci5221-viro-project,chenyuntc/pox,waltznetworks/pox,xAKLx/pox,denovogroup/pox,MurphyMc/pox,noxrepo/pox,carlye566/IoT-POX,VamsikrishnaNallabothu/pox,VamsikrishnaNallabothu/pox,waltznetworks/pox,VamsikrishnaNallabothu/pox,waltznetworks/pox,kulawczukmarcin/mypox,denovogroup/pox,PrincetonUniversity/pox,VamsikrishnaNallabothu/pox,MurphyMc/pox,chenyuntc/pox,diogommartins/pox,kulawczukmarcin/mypox,MurphyMc/pox,kpengboy/pox-exercise,carlye566/IoT-POX