Constraints: add docs for the case when slave attribute missing
Constraints: add docs for the case when slave attribute missing

Change-Id: I2cca028e5ec53c2ee4dc2764c6172e16aa68998c

titosand/marathon,c089/marathon,natemurthy/marathon,sepiroth887/marathon,IanSaunders/marathon,pgkelley4/marathon,meln1k/marathon,sledigabel/marathon,gsantovena/marathon,mesosphere/marathon,manojlds/marathon,Yhgenomics/marathon,sielaq/marathon,matsluni/marathon,ramitsurana/marathon,ramitsurana/marathon,EasonYi/marathon,guenter/marathon,Kosta-Github/marathon,drewrobb/marathon,timcharper/marathon,rtward/marathon,14Zen/marathon,sepiroth887/marathon,gsantovena/marathon,EasonYi/marathon,bsideup/marathon,natemurthy/marathon,lelezi/marathon,MrMarvin/marathon,mesosphere/marathon,ss75710541/marathon,drewrobb/marathon,mesosphere/marathon,mikejihbe/marathon,janisz/marathon,murat-lacework/marathon,natemurthy/marathon,SivagnanamCiena/marathon,drewrobb/marathon,ramitsurana/marathon,felixb/marathon,rtward/marathon,bsideup/marathon,sielaq/marathon,cherrydocker/marathon-1,pgkelley4/marathon,guenter/marathon,MrMarvin/marathon,IanSaunders/marathon,okuryu/marathon,cgvarela/marathon,ss75710541/marathon,janisz/marathon,14Zen/marathon,timcharper/marathon,mesosphere/marathon,cgvarela/marathon,mikejihbe/marathon,ayouwei/marathon,HardikDR/marathon,Caerostris/marathon,spacejam/marathon,vivekjuneja/marathon,sledigabel/marathon,felixb/marathon,SivagnanamCiena/marathon,quamilek/marathon,c089/marathon,hangyan/marathon,mikejihbe/marathon,meln1k/marathon,rtward/marathon,sledigabel/marathon,gsantovena/marathon,drewrobb/marathon,IanSaunders/marathon,janisz/marathon,lelezi/marathon,manojlds/marathon,Yhgenomics/marathon,Caerostris/marathon,gsantovena/marathon,sielaq/marathon,cgvarela/marathon,vivekjuneja/marathon,hangyan/marathon,janisz/marathon,spacejam/marathon,pugna0/marathon,c089/marathon,quamilek/marathon,ayouwei/marathon,EasonYi/marathon,Caerostris/marathon,sepiroth887/marathon,timcharper/marathon,vivekjuneja/marathon,mesosphere/marathon,cherrydocker/marathon-1,sielaq/marathon,titosand/marathon,gsantovena/marathon,Yhgenomics/marathon,murat-lacework/marathon,janisz/marathon,murat-lacework/marathon,felixb/marathon,MrMarvin/marathon,meln1k/marathon,SivagnanamCiena/marathon,c089/marathon,spacejam/marathon,guenter/marathon,okuryu/marathon,meln1k/marathon,guenter/marathon,manojlds/marathon,HardikDR/marathon,yp-engineering/marathon,pugna0/marathon,14Zen/marathon,cherrydocker/marathon-1,pugna0/marathon,ayouwei/marathon,guenter/marathon,matsluni/marathon,yp-engineering/marathon,quamilek/marathon,felixb/marathon,matsluni/marathon,spacejam/marathon,okuryu/marathon,Kosta-Github/marathon,lelezi/marathon,bsideup/marathon,HardikDR/marathon,Caerostris/marathon,hangyan/marathon,meln1k/marathon,Caerostris/marathon,14Zen/marathon,ss75710541/marathon