amo/monitors: don't error on twemproxy.
amo/monitors: don't error on twemproxy.

Don't error if there is only one memcached server configured and that
server is 127.0.0.1.

Nolski/olympia,lavish205/olympia,Joergen/olympia,mdaif/olympia,wagnerand/addons-server,Joergen/olympia,andymckay/zamboni,muffinresearch/addons-server,johancz/olympia,koehlermichael/olympia,diox/zamboni,bqbn/addons-server,mdaif/olympia,diox/zamboni,washort/zamboni,Joergen/olympia,harikishen/addons-server,Witia1/olympia,elysium001/zamboni,mozilla/addons-server,wagnerand/olympia,clouserw/zamboni,andymckay/zamboni,mdaif/olympia,muffinresearch/olympia,atiqueahmedziad/addons-server,Nolski/olympia,beni55/olympia,koehlermichael/olympia,ngokevin/zamboni,Nolski/olympia,crdoconnor/olympia,kmaglione/olympia,aviarypl/mozilla-l10n-addons-server,ayushagrawal288/zamboni,mozilla/zamboni,anaran/olympia,SuriyaaKudoIsc/olympia,wagnerand/addons-server,mrrrgn/olympia,Joergen/olympia,kumar303/zamboni,Witia1/olympia,yfdyh000/olympia,yfdyh000/olympia,lavish205/olympia,muffinresearch/olympia,Hitechverma/zamboni,muffinresearch/olympia,ayushagrawal288/zamboni,ngokevin/zamboni,beni55/olympia,jasonthomas/zamboni,kumar303/addons-server,andymckay/addons-server,spasovski/zamboni,yfdyh000/olympia,andymckay/addons-server,mudithkr/zamboni,robhudson/zamboni,kumar303/addons-server,wagnerand/addons-server,Prashant-Surya/addons-server,harry-7/addons-server,mudithkr/zamboni,spasovski/zamboni,tsl143/zamboni,ayushagrawal288/zamboni,mozilla/addons-server,clouserw/zamboni,harikishen/addons-server,Prashant-Surya/addons-server,mozilla/olympia,mstriemer/zamboni,johancz/olympia,Revanth47/addons-server,magopian/olympia,kumar303/addons-server,eviljeff/zamboni,harikishen/addons-server,koehlermichael/olympia,atiqueahmedziad/addons-server,spasovski/zamboni,eviljeff/olympia,crdoconnor/olympia,jamesthechamp/zamboni,mozilla/olympia,bqbn/addons-server,johancz/olympia,jpetto/olympia,Witia1/olympia,kumar303/addons-server,magopian/olympia,ddurst/zamboni,andymckay/olympia,mozilla/olympia,crdoconnor/olympia,crdoconnor/olympia,ddurst/zamboni,magopian/olympia,kumar303/zamboni,harry-7/addons-server,wagnerand/zamboni,mstriemer/addons-server,washort/zamboni,anaran/olympia,Revanth47/addons-server,wagnerand/zamboni,wagnerand/olympia,kumar303/olympia,jpetto/olympia,diox/olympia,mstriemer/zamboni,Prashant-Surya/addons-server,eviljeff/zamboni,mstriemer/olympia,magopian/olympia,aviarypl/mozilla-l10n-addons-server,shahbaz17/zamboni,shahbaz17/zamboni,diox/olympia,kmaglione/olympia,luckylavish/zamboni,washort/zamboni,crdoconnor/olympia,Revanth47/addons-server,mstriemer/olympia,mstriemer/zamboni,clouserw/zamboni,tsl143/zamboni,mdaif/olympia,muffinresearch/olympia,atiqueahmedziad/addons-server,ingenioustechie/zamboni,wagnerand/addons-server,anaran/olympia,mstriemer/zamboni,harry-7/addons-server,wagnerand/zamboni,tsl143/addons-server,tsl143/zamboni,diox/zamboni,kumar303/zamboni,koehlermichael/olympia,kmaglione/olympia,kumar303/olympia,andymckay/olympia,andymckay/olympia,kumar303/olympia,muffinresearch/olympia,mudithkr/zamboni,Joergen/olympia,Prashant-Surya/addons-server,mstriemer/addons-server,bqbn/addons-server,kmaglione/olympia,Nolski/olympia,Nolski/olympia,elysium001/zamboni,andymckay/olympia,luckylavish/zamboni,jpetto/olympia,ayushagrawal288/zamboni,SuriyaaKudoIsc/olympia,Jobava/zamboni,tsl143/addons-server,mozilla/zamboni,SuriyaaKudoIsc/olympia,tsl143/addons-server,Hitechverma/zamboni,wagnerand/olympia,beni55/olympia,ingenioustechie/zamboni,muffinresearch/addons-server,psiinon/addons-server,eviljeff/olympia,andymckay/zamboni,Jobava/zamboni,jpetto/olympia,johancz/olympia,jamesthechamp/zamboni,mozilla/addons-server,mrrrgn/olympia,atiqueahmedziad/addons-server,koehlermichael/olympia,diox/olympia,andymckay/addons-server,psiinon/addons-server,ddurst/zamboni,jamesthechamp/zamboni,mrrrgn/olympia,bqbn/addons-server,mozilla/olympia,andymckay/addons-server,beni55/olympia,johancz/olympia,Witia1/olympia,psiinon/addons-server,eviljeff/zamboni,jamesthechamp/zamboni,muffinresearch/addons-server,clouserw/zamboni,lavish205/olympia,yfdyh000/olympia,robhudson/zamboni,mstriemer/olympia,ngokevin/zamboni,mstriemer/addons-server,tsl143/zamboni,elysium001/zamboni,jasonthomas/zamboni,mrrrgn/olympia,elysium001/zamboni,mozilla/addons-server,diox/olympia,wagnerand/olympia,beni55/olympia,eviljeff/zamboni,magopian/olympia,mdaif/olympia,mozilla/zamboni,luckylavish/zamboni,eviljeff/olympia,kumar303/zamboni,yfdyh000/olympia,mudithkr/zamboni,harry-7/addons-server,mstriemer/addons-server,robhudson/zamboni,Hitechverma/zamboni,anaran/olympia,muffinresearch/addons-server,mrrrgn/olympia,eviljeff/olympia,tsl143/addons-server,aviarypl/mozilla-l10n-addons-server,washort/zamboni,muffinresearch/addons-server,ingenioustechie/zamboni,jasonthomas/zamboni,spasovski/zamboni,aviarypl/mozilla-l10n-addons-server,shahbaz17/zamboni,SuriyaaKudoIsc/olympia,mstriemer/olympia,psiinon/addons-server,ingenioustechie/zamboni,lavish205/olympia,wagnerand/zamboni,diox/zamboni,mozilla/zamboni,shahbaz17/zamboni,kumar303/olympia,jasonthomas/zamboni,luckylavish/zamboni,Revanth47/addons-server,harikishen/addons-server,robhudson/zamboni,ddurst/zamboni,kmaglione/olympia,Witia1/olympia,Jobava/zamboni,Hitechverma/zamboni,Jobava/zamboni