appliance/etcd: Work around etcd argument parsing regression
appliance/etcd: Work around etcd argument parsing regression

Fixes this message due to the potentially empty initial arguments
slot:

    etcd: error verifying flags, '' is not a valid flag. See 'etcd -help'.

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

clifff/flynn,josephglanville/flynn,felixrieseberg/flynn,lmars/flynn,TribeMedia/flynn,rikur/flynn,felixrieseberg/flynn,TribeMedia/flynn,philiplb/flynn,pkdevbox/flynn,benbjohnson/flynn,rikur/flynn,TribeMedia/flynn,schatt/flynn,pkdevbox/flynn,tonicbupt/flynn,supermario/flynn,justintung/flynn,benbjohnson/flynn,schatt/flynn,supermario/flynn,supermario/flynn,jzila/flynn,justintung/flynn,schatt/flynn,clifff/flynn,GrimDerp/flynn,technosophos/flynn,kgrz/flynn,jzila/flynn,shads196770/flynn,kgrz/flynn,ozum/flynn,kgrz/flynn,schatt/flynn,arekkas/flynn,tonicbupt/flynn,josephglanville/flynn,tonicbupt/flynn,whouses/flynn,felixrieseberg/flynn,GrimDerp/flynn,supermario/flynn,flynn/flynn,jzila/flynn,justintung/flynn,Brandywine2161/flynn,justintung/flynn,jzila/flynn,Brandywine2161/flynn,Brandywine2161/flynn,ozum/flynn,technosophos/flynn,tonicbupt/flynn,jzila/flynn,flynn/flynn,rikur/flynn,arekkas/flynn,philiplb/flynn,flynn/flynn,benbjohnson/flynn,whouses/flynn,clifff/flynn,Brandywine2161/flynn,GrimDerp/flynn,whouses/flynn,GrimDerp/flynn,supermario/flynn,pkdevbox/flynn,ozum/flynn,lmars/flynn,TribeMedia/flynn,justintung/flynn,lmars/flynn,josephglanville/flynn,pkdevbox/flynn,shads196770/flynn,schatt/flynn,shads196770/flynn,shads196770/flynn,lmars/flynn,tonicbupt/flynn,clifff/flynn,josephglanville/flynn,TribeMedia/flynn,flynn/flynn,arekkas/flynn,felixrieseberg/flynn,kgrz/flynn,rikur/flynn,ozum/flynn,Brandywine2161/flynn,rikur/flynn,philiplb/flynn,technosophos/flynn,schatt/flynn,TribeMedia/flynn,philiplb/flynn,josephglanville/flynn,philiplb/flynn,clifff/flynn,GrimDerp/flynn,technosophos/flynn,whouses/flynn,arekkas/flynn,justintung/flynn,shads196770/flynn,shads196770/flynn,flynn/flynn,lmars/flynn,kgrz/flynn,benbjohnson/flynn,ozum/flynn,josephglanville/flynn,benbjohnson/flynn,felixrieseberg/flynn,ozum/flynn,benbjohnson/flynn,pkdevbox/flynn,jzila/flynn,GrimDerp/flynn,arekkas/flynn,whouses/flynn,pkdevbox/flynn,kgrz/flynn,rikur/flynn,technosophos/flynn,whouses/flynn,clifff/flynn,supermario/flynn,Brandywine2161/flynn